#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int d = (b+c) / 2;
  int e = (c+a) / 2;
  int f = (a+b) / 2;
  if(a==d || b==e || c==f){
    cout << "Yes" << endl;
  }
  else{
    cout << "No" << endl;
  }
}
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>

int main()
{
  std::vector<int> a(3);
  for (auto &x : a)
  {
    std::cin >> x;
  }
  std::sort(a.begin(), a.end());
  std::string s = ((a[2] - a[1]) == (a[1] - a[0])) ? "Yes" : "No";
  std::cout << s;
}