#include <iostream>
using namespace std;

int main() {
    int a, b, n;
    cin >> a >> b >> n; 

    a = a % b; 

    for(int i = 0; i < n - 1; ++i) {
        a = (a * 10) % b;
    }

    a = (a * 10) / b;
    cout << a << endl;

    return 0;
}