#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
int main(){
  int a,b;
  cin >> a >> b;
  if(a==b) cout << "Yes\n";
  else if(a==2 && b==4) cout << "Yes\n";
  else if(a==4 && b==2) cout << "Yes\n";
  else cout << "No\n";
  return 0;
}