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