#include <bits/stdc++.h>
int main() {
  int a, b, c;
  std::cin >> a >> b >> c;
  std::vector<int> v(3);
  v[0] = a;
  v[1] = b;
  v[2] = c;
  std::sort(v.begin(), v.end());
  if (v[0] + v[1] == v[2]) {
    std::cout << "YES" << std::endl;
  } else {
    std::cout << "NO" << std::endl;
  }
  return 0;
}
