#include <bits/stdc++.h>
using namespace std;
int main() {
  int A, B, C;
  scanf("%d %d %d", &A, &B, &C);
  if ((max(max(A, B), C) * 2) == (A + B + C)) {
    printf("YES");
  } else {
    printf("NO");
  }
  return 0;
}
