#include <bits/stdc++.h>
int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);
  if ((a + b + c) % 2 == 0) {
    if ((a + b == c) || (a + c == b) || (b + c == a)) {
      printf("YES");
    } else {
      printf("NO");
    }
  }
  return 0;
}
