#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n,a,b,t;
	cin>>a>>b>>n;
		for(int i = 1 ;i <= n;i++)
	    {
	    	t = a%b;
	    	a = t*10;
		}
		cout<<a/b;
	return 0;
}