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