#include <iostream>
#include <string>
#include <vector>
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;
}