Contest1236/D.cpp

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a, n;
    cin >> a >> n;
    int s = 0, t = a;
   for(int i=0;i<n;i++) {
        s = s + t;
        t = t * 10 + a;
          
    }
    cout<<s<<endl;
    return 0;
}