#include <bits/stdc++.h>

using namespace std;

int main ()
{
	long long n, a = 1, b = 1, c;
	scanf ("%lld", &n);
	if (n == a)
	{
		printf ("YES");
		exit (0);
	}
	while (1)
	{
		c = a + b;
		a = b;
		b = c;
		if (n == c)
		{
			printf ("YES");
			exit (0);
		}
		if (c > n)
		{
			printf ("NO");
			exit (0);
		}
	}
	return 0;
}