#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>


typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;



int main()
{

    int Q;
    Q = 1;
    //cin >> Q;
    
    
    while (Q--) {

        vector<int>x(4);
        set<int>t;
        for (int i = 0; i < 4; i++) {
            cin >> x[i]; t.insert(x[i]);
        }
        sort(x.begin(), x.end());
        
        if (t.size() == 4 && x[0] + 3 == x[3]) {
            cout << "Yes";
        }
        else cout << "No";
       

    }
    return 0; 
}