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