#include<iostream>
using namespace std;

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