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