#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, t = 1;
  cin >> a >> b >> c;
  if (a + b == c || a + c == b || b + c == a)
    cout << "YES"
         << "\n";
  else
    cout << "NO"
         << "\n";
  return 0;
}
