#include <iostream>
#include<algorithm>
#include<string>
#include<stack>
#include<iomanip>
#include<cmath>
#include<cstring>
#include<vector>
using namespace std;
int main()
{
	int a, b, n;
	cin >> a >> b>>n;
	if (!(a >= 0 && a <= 100) || !(a <= b) || !(b >= 0 && b <= 100)) return 0;
	if (!(n >= 1 && n <= 10000)) return 0;

	double num = (a*1.0) / b;
	for (int i = 0; i < n; ++i)
	{
		num *= 10.0;
	}

	cout << int(num) % 10 << endl;
	return 0;
}