#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
int main(){
  int a, b, n;
  while(cin >> a >> b >> n){
    int ans = 0;
    a %= b;
    
    for(int i = 0 ; i < n ; i++){
      a *= 10;
      ans += a / b;
      //cout << a / b << endl;
      a %= b;
    }
    cout << ans << endl;
  }
  return 0;
}