#include <iostream>
#include <fstream>
#include <string>

using namespace std;

ifstream fin("reassembly.in");
ofstream fout("reassembly.out");

struct bigdata{
    int digi[114];
    bigdata(){
        for(int i = 0; i < 100; i++){
            digi[i] = 0;
        }
    }
    bigdata(string s) : bigdata(){
        for(int i = 0; i < s.size(); i++){
            digi[s.size()-i-1] = s[i]-'0';
        }
    }
    void add(bigdata & rhs){
        int r;
        for(int i = 0; i < 100; i++){
            digi[i] += rhs.digi[i];
            digi[i] += r;
            r = digi[i] / 10;
            digi[i] %= 10;
        }
    }
    void write(ostream & out){
        bool showit = false;
        for(int i = 99; i >= 0; i--){
            if(digi[i] != 0){
                showit = true;
            }
            if(showit){
                out << digi[i];
            }
        }
        out << "\n";
    }
};

void solveit(){
    bigdata sum;
    string s;
    int n;
    fin >> s >> n;
    while(s.size() % n != 0){
        s += '0';
    }

    for(int i = 0; i < s.size()/n; i++){
        bigdata a(s.substr(i*n, n));
        sum.add(a);
    }
    sum.write(fout);
}

int main()
{
    for(int acsl = 0; acsl < 5; acsl++){
        solveit();
    }
    return 0;
}