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