#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[4];
    cin >> a[0] >> a[1] >> a[2] >> a[3];
    sort(a,a+4);
    if(a[3]+a[1]-a[2]-a[0]==2) cout << "Yes" << endl;
    else cout << "No" << endl;
}