#include <bits/stdc++.h>
using namespace std;
int main() {
  int l, a[3];
  int i = 0;
  while (cin >> l) {
    a[i] = l;
    i++;
  }
  if (a[0] == a[1] + a[2] || a[1] == a[0] + a[2] || a[2] == a[1] + a[0]) {
    cout << "YES";
  } else {
    cout << "NO";
  }
  return 0;
}
