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