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