#include <iostream>
using namespace std;


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

	return 0;
}