#include <bits/stdc++.h>

using namespace std;

int main()
{
    int a, b, n;
    while (cin >> a >> b >> n) {
        int sum = 0;
        a *= 10;

        for (int i = 0; i < n; i++) {
            sum += (a / b) % 10;
            a %= b;
            a *= 10;
        }
        cout << sum << endl;
    }
    return 0;
}