#include <bits/stdc++.h>
using namespace std;
int main(void){
    int A,B;
    cin >> A >> B;
    if( A == B || ( A == 2 && B == 4 ) || ( A == 4 && B == 2 ) ) {
        cout << "Yes" << endl;
    }else {
        cout << "No" << endl;
    }
}