View Code of Problem 86

#include <iostream>
using namespace std;

int main(){
  int a,n,sum=0,s;
  scanf("%d%d",&a,&n);
  s = a;
  for(int k=1;k<=n;k++){
    sum += s;
    a *= 10;
    s += a;
  }
  printf("%d",sum);
}