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