#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, ave;
  cin >> a >> b >> c;
  ave == (a + b + c) / 2;
  if (a != ave || b != ave || c != ave) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}
