#include<iostream>
#include<cstdio>
using namespace std;

int main(){
	int a, b, n;
	while (cin >> a >> b >> n){
		int sum = 0;
		for (int i = 1; i <= n; i++){
			a *= 10;
			sum += a / b % 10;
			a %= b;
		}
		printf("%d\n", sum);
	}
	return 0;
}