#include <bits/stdc++.h>
using namespace std;
bool solve(int a, int b){
  if(a == b) return true;
  else{
    if(a == 2 && b == 4 || a == 4 && b == 2) return true;
    else return false;
  }
}

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  int a, b; cin >> a >> b;
  if(solve(a, b)) cout << "Yes" << '\n';
  else cout << "No" << '\n';
  return 0;
}