#include<bits/stdc++.h> using namespace std; int main(){ long long n,a=1,b=1,c; scanf("%lld",&n); if(na) { printf("YES"); exit(0); } while(1) { c=a+b; a=b; b=c; if(nc) { printf("YES"); exit(0); } if(c>n) { printf("NO"); exit(0); } } return 0; }