#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 (C + A == B)
    printf("YES");
  else if (B + C == A)
    printf("YES");
  else
    printf("NO");
  return 0;
}
