#include <math.h>
#include <stdio.h>

int NaturalCheck(double num)
{
	double integral = 0.0f;
	double fractional = 0.0f;

	printf("%lf\n", num);

	fractional = modf(num, &integral);

	if ((num >= 0) && (fractional == 0.0))
	{
		return 1;
	}
	else
	{
		return -1;
	}
}

int main()
{
	double num;

	scanf("%lf", &num);
	
	printf("%d\n", NaturalCheck(num));

	return 0;
}