#include<cstdio>

class LB {
 private:
  long long num[63];
 public:
  LB() {
    for(int i = 0; i < 63; ++i) {
      num[i] = 0;
    }
  }
  void insert(long long key) {
    for(int i = 62; i >= 0; --i) {
      if(((key >> i) & 1) ^ 1) continue;
      if(num[i] == 0) {
        num[i] = key;
        break;
      } else {
        key ^= num[i];
      }
    }
  }
  long long maxxor() {
    long long res = 0;
    for(int i = 62; i >= 0; --i) {
      if((res >> i) & 1) continue;
      res ^= num[i];
    }
    return res;
  }
};

LB lb;

int main() {
  int num;
  scanf("%d", &num);
  for(int i = 1; i <= num; ++i) {
    long long key;
    scanf("%lld", &key);
    lb.insert(key);
  }
  printf("%lld\n", lb.maxxor());
  return 0;
}