#include <iostream>

using namespace std;

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

  while (cin >> a >> b >> n){
    int s = 0;
    for (int i = 0; i < n; i++){
      a *= 10;
      s += a / b % 10;
      a %= b;
    }
    cout << s << endl;
  }

  return (0);
}