#include<bits/stdc++.h>
using namespace std;
long long n,a[100000],k;
int main()
{
	cin>>n;
	if (n==1)
	{
		cout<<"YES";
		return 0;
	}
	a[1]=1;
	a[2]=1;
	k=2;
	while (1)
	{
		if (a[k]>n) break;
		if (a[k]==n) 
		{
			cout<<"YES";
			return 0;
		}
		k++;
		a[k]=a[k-1]+a[k-2];
	}
	cout<<"NO";
	return 0;
}