#include <bits/stdc++.h>
using namespace std;
int main() {
  int A, B, C;
  cin >> A >> B >> C;
  int a, b, c;
  a = A + B;
  b = A + C;
  c = B + C;
  if (A == c || B == b || C == a) {
    cout << "yes" << endl;
  } else {
    cout << "No" << endl;
  }
  return 0;
}
