#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 (a + c == b) {
    printf("YES");
  } else if (b + c == a) {
    printf("YES");
  } else {
    printf("NO");
  }
  return 0;
}
