#include <iostream>

using namespace std;


int main(int argc, char const* argv[])
{
	double a,b,f;
	int n;

	while( cin >> a >> b >> n ){
		f = a / b;
		f -= int( f );
		int answer = 0;;

		for( int i = 0;i < n;i++ ){
			f *= 10;
			answer += int( f );
			f -= int( f );
		}
		cout << answer << endl;

	}
	return 0;
}