#include <stdio.h>
int main()
{
	double a, b;int n;
	scanf("%lf %lf %d", &a, &b, &n);
	double d = a / b;
	while (n--)
		{
  			d *= 10;
  		}
	int c = (int)d % 10;
	printf("%d", c);

  	return 0;
}