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