#include <bits/stdc++.h>
using namespace std;
using ll = long long;
typedef vector<ll> vec;
#define MAX 1000000007 



int main() {
  ll a,b,c,d;
  cin>>a>>b>>c>>d;
  if(a==b+c+d || b==c+d+a || c==b+a+d || d==b+c+a || a+b==c+d || a+c==b+d || a+d==b+c ){
      cout<<"Yes"<<"\n";
  }
  else{
      cout<<"No"<<"\n";
  }
  
}
    

#include<cstdio>
#define max(a,b) (((a)>(b))?(a):(b))
using namespace std;
int a,b,c;
int main() {
	scanf("%d%d%d",&a,&b,&c);
	printf("%d",max(c+max(a,b),a+b));
	return 0;
}