#include <bits/stdc++.h>
int main() {
  int a, b, 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 (c + a == b) {
        printf("YES\n");
      } else {
        printf("NO\n");
      }
    }
  }
  system("pause");
}
