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