#include <iostream>
using namespace std;
const int INF = 1 << 29;
signed main(){
	int a, b, c;
	while (cin >> a){
		cin >> b >> c;
		int s = 0;
		for (int i = 10; a*i<INF; i *= 10) s += (a*i/b) % 10;
		cout << s << endl;
	}
	return 0;
}