#include <iostream>
using namespace std;

int main(){
  int a,b,d;
  int n;

  while(cin >> a >> b >> n){
    int sum = 0;
    a *= 10;

    for(int i = 0 ; i < n ; i++){
      sum += (a / b) % 10;
      a %= b;
      a *= 10;
    }

    cout << sum << endl;
  }

  return 0;
}