#include <bits/stdc++.h>
#include <math.h>
using namespace std;
#define ll long long int

void solve(long long int n)  
{  
}  
int main()
{
    ll a,b;
    cin >> a >> b;
    ll A = pow(a,b), B=pow(b,a);
    if(A == B){
        cout << "YES";
    }
    else cout << "NO";
    return 0;
}