text: #include <bits/stdc++.h>
  using namespace std;
  
  int main() {
  	int A[4];
  	for (int i = 0; i < 4; i++) {
  		cin >> A[i];
  	}
  	sort(A, A+4);
  	if (A[0] + A[3] == A[1] + A[2]) {
  		cout << "Yes" << endl;
  	} else if (A[0] + A[1] + A[2] == A[3]) {
  		cout << "Yes" << endl;
  	} else {
  		cout << "No" << endl;
  	}
  	return 0;
  }
  