#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using pii = pair<int, int>;

int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(10);
  
  int a, b, n;
  while (cin >> a >> b >> n) {
    int ans = 0;
    for (int i = 0; i < n; i++) {
      (a %= b) *= 10;
      ans += a / b;
    }
    cout << ans << endl;
  }

  return 0;
}
