#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, d, e, f, g, h, i, j, k;
  cin >> a >> b >> c;
  d = max(a, max(b, c));
  e = a + b + c - d;
  if (e == d)
    cout << "YES";
  else if (a == b && b == c)
    cout << "YES";
  else
    cout << "NO";
}
