#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c = 0;
  cin >> a >> b >> c;
  int m = 0;
  int w = 0;
  if (a >= b && a >= c) {
    m = a;
  } else if (b >= a && b >= c) {
    m = b;
  } else if (c >= a && c >= b) {
    m = c;
  }
  w = a + b + c;
  if (w == (2 * m)) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
  return 0;
}
