#include<iostream>
using namespace std;

int main()
{
    long long a, b, k;

	cin >> a >> b >> k;
	long long s=a,x = 10;
	k--;
	while(k)
	{
		if(k&1)
		{
			s=(s*x)%b;
		}
		k/=2;
		x=(x*x)%b;
	}
	cout << s*10/b << endl;
	return 0;
}