#include<iostream>
#include<algorithm>
using namespace std;

int main(void)
{
  int a[3],Nmax = 0;
  cin >> a[0]>> a[1] >> a[2];
  sort(a.begin().a.end());
  
  if(a[2] == a[1] + a[0]){cout << "YES";}
  else{cout << "NO";}
  return 0;
}