#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;

int main()
{
	long long a, b, n;
	cin >> a >> b >> n;
	double c = 1.0 * a / b;
	c = c - int(c);
	for (int i = 1; i < n; i++)
	{
		c = c * 10;
		c = c - (int)c;
	}
	c = c * 10;
	cout << (int)c;
	return 0;
}