#include <iostream>
using namespace std;

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