import java.util.Scanner;

public class Diff {
    static String s1,s2;
    static String[] word1;
    static String[] word2;

    static void input() {
        Scanner input = new Scanner(System.in);
        s1 = input.nextLine();
        s2 = input.nextLine();
        int len1 = s1.length();
        int len2 = s2.length();
    
        // for(int i=0;i<word1.length;i++) System.out.println(word1[i]);
    }
    
    static String process(String A, String B)
    {
        String common="";
        word1 = A.split(" ");
        word2 = B.split(" ");
        int len1 = word1.length;
        int len2 = word2.length;
        for(int i=0;i<len1;i++)
        {
            for(int j=0;j<len2;j++)
            {
                int pos = word2[j].indexOf(word1[i]);
                if(pos!=-1)
                {
                    word2[j] = word2[j].substring(0,pos) + word2[j].substring(pos+word1[i].length());
                    common = common + word1[i];
                    break;
                }
            }
        }
        return common;
    }
    
    static String declan(String c1, String c2)
    {
        String ans="";
        int len1 = c1.length();
        for(int i=0;i<len1;i++)
        {
            String tmp  = c1.substring(i, i+1);
    
            int pos = c2.indexOf(tmp);
            if(pos==-1) continue;
            ans = ans + tmp;
    
            c2 = c2.substring(pos+1);
        }
        return (ans=="")?("NONE"):(ans);
    }
    
    public static void main(String[] args)
    {
        for(int i=0;i<5;i++)
        {
            System.out.println("Please enter No."+(i+1)+" line of the input data:");
            input();
            String common1 = process(s1,s2);
            String common2 = process(s2,s1);
            System.out.println("The answer to No."+(i+1)+"line is:");
            System.out.println(declan(common1,common2));
            // System.out.println(common1);
            // System.out.println(common2);
        }
        System.out.println("All output done...");
        System.out.println("Thanks for your testing");
        
        // return;
    }
}
/*
The quick brown fox did jump over a log
The brown rabbit quickly did outjump the fox
How much wood would a woodchuck chuck if a woodchuck could
chuck wood He would chuck as much wood as a woodchuck could
I scream you scream we all scream for ice cream
He screams she screams they all scream for a creamery
A skunk sat on a stump and thunk the stump stunk
but the stump thunk the skunk stunk
I have got a date at a quarter to eight
I will see you at the gate so do not be late

abc defgh ijkl mnopq rstuv wxyz
ab cdefgh ijklmn opq rst uv w xy z
*/

import java.util.Scanner;
public class digitReassembly {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        
        String s1 = input.next();
        String s2 = input.next();

        input.close();

        int num = Integer.valueOf(s2);

        while(s1.length()%num!=0)
        {
            s1 = s1 + "0";
        }

        int ans = 0;
        int cnt = s1.length()/num;
        int p = 0;
        for(int i=0;i<cnt;i++)
        {
            ans += Integer.valueOf(s1.substring(p,p+num));
            p = p+num;
        }

        System.out.println(ans);
    }
}

import java.util.Scanner;

public class CHMOD
{
    static String[] num = new String[4];
    public static void input()
    {
        Scanner input = new Scanner(System.in);
        String s = input.next();
        int len = s.length();
        int cnt = 0;
        num[cnt++] = s.substring(0, 1);
        for(int i=1;i<len;i++)
        {
            if(s.charAt(i)>='0' && s.charAt(i)<='9')
            {
                num[cnt++] = Integer.toBinaryString(s.charAt(i)-'0');
            }
        }
        input.close();
    }

    public static void process()
    {
        String[] ans = new String[]{"","","",""};
        for(int i=1;i<4;i++)
        {
            while(num[i].length()<3) num[i] = '0' + num[i];
            if(num[i].charAt(0) == '1') ans[i] += 'r'; else ans[i] += '-';
            if(num[i].charAt(1) == '1') ans[i] += 'w'; else ans[i] += '-';
            if(num[i].charAt(2) == '1') ans[i] += 'x'; else ans[i] += '-';
        }
        
        boolean flag1,flag2,flag3;
        flag1 = flag2 = flag3 = false;

        if(num[0].charAt(0)=='1' && ans[1].charAt(2)=='x') flag1 = true;
        if(num[0].charAt(0)=='2' && ans[2].charAt(2)=='x') flag2 = true;
        if(num[0].charAt(0)=='4' && ans[3].charAt(2)=='x') flag3 = true;
        
        for(int i=1;i<4;i++)
        {
            System.out.print(num[i]+" ");
        }
        System.out.print("and ");

        
        if(ans[1].charAt(2)=='x' && flag1 == true)
        {
            System.out.print( ans[1].charAt(0) );
            System.out.print( ans[1].charAt(1) );
            System.out.print("s");
        }
        else System.out.print(ans[1]+" ");

        if(ans[2].charAt(2)=='x' && flag2 == true)
        {
            System.out.print( ans[2].charAt(0) );
            System.out.print( ans[2].charAt(1) );
            System.out.print("s");
        }
        else System.out.print(ans[2]+" ");

        if(ans[3].charAt(2)=='x' && flag3 == true)
        {
            System.out.print( ans[3].charAt(0) );
            System.out.print( ans[3].charAt(1) );
            System.out.print("t");
        }
        else System.out.print(ans[3]);

        
    }

    
    public static void main(String[] args)
    {
        input();
        process();
    }
}

/*
0,5,2,6
1,7,3,0
2,4,1,5
4,2,3,4
4,5,6,7

*/

// the data type must be a type of class
ArrayList<String>  a = new ArrayList<String>();
ArrayList<Integer> b = new ArrayList<Integer>();

// the size of the ArrayList
arrayList.size();

// add data to the ArrayList
arrayList.add("DATA");

// replace data by returning the value of the replaced data
arrayList.set();

// remove data by returning the value of the removed data
arratList.remove();