#include <bits/stdc++.h>
using namespace std;
int main(void) {
  int a = 0;
  int b = 0;
  int c = 0;
  cin >> a >> b >> c;
  if (a + b == c || b + c == a || c + a == b)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
