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