#include <iostream>

using namespace std;

int main()
{
	int a,b,n;
	while( cin>>a >>b >>n){
		int sum=0;
		for(int i=0;i<n;i++){
			a = ( a % b ) *10;
			sum += a/b;
		}
		
		cout<<sum<<endl;
	}
	return 0;
}