#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int a, b, c;
  cin >> a >> b >> c;
  bool can = 0;
  if (a + b == c) can = 1;
  if (c + b == a) can = 1;
  if (a + c == b) can = 1;
  if (can)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
