#include <bits/stdc++.h>

int main() {
  
  int N;
  std::vector<long> v;
  long temp;
  long mask, mask1, mask2;

  long count;
  long ans;
  bool b;
  
  std::cin >> N;
  for(int i = 0; i < N; ++i) {
    std::cin >> temp;
    v.push_back(temp);
  }

  count = 0;
  for(int i = 0; i < 64; ++i) {
    for(int j = i+1; j < 64; ++j) {
      mask = (1ULL << i) | (1ULL << j);
      mask1 = (1ULL << i);
      mask2 = (1ULL << j);
      b = true;
      for(int k = 0; k < N; ++k) {
	if( (v[k] & mask) == mask1 || (v[k] & mask) == mask2 ) {
	  b = false;
	  break;
	}
      }
      if( b ) {
	count++;
      }
    }
  }

  ans = 1;
  for(int i = 1; i < 64 - (int)sqrt(2*count); ++i) {
    ans *= 2;
  }

  std::cout << ans << std::endl;
  
  return 0;
}