#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;
}