#include <iostream>

using namespace std;

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