#include <iostream>

using namespace std;

int main() {
  int a, b, n, d;
  cin >> a >> b >> n;
  a %= b;
  for (int i = 0; i < n; i++) {
    d = a * 10 / b;
    a = a * 10 % b;
  }
  cout << d;
  return 0;
}