#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  a + b == c || a + c == b || b + c == a ? cout << "YES" << endl
                                         : cout << "NO" << endl;
  return 0;
}
