#include <bits/stdc++.h>
using namespace std;
int dx[4] = {0, 0, -1, 1};
int dy[4] = {-1, 1, 0, 0};
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  if (a + b == c || b + c == a || c + a == b)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}
