at 105A

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
int main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);cout.tie(0);
   ll a[1000] ,c,d,e,f,i,j,k,l;
   for(i=0;i<4;i++)
   {
       cin>>a[i];
   }
   sort(a,a+4);
   if(a[0]+a[1]+a[2]==a[3]||a[0]+a[3]==a[1]+a[2])cout<<"Yes"<<endl;
    else cout<<"No"<<endl;


   return 0;
}