#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,popcnt")

#include <cstdio>
#include <array>

using u64 = unsigned long long;
using u32 = unsigned;

using bs_t = std::array<u64, 1<<(30-6)>;

bs_t B;

void set(bs_t &B, u32 i){
  B[i/64] |= 1ULL << (i%64);
}

void zeta(bs_t &B){
  for(u32 i = 1; i < B.size(); i <<= 1){
    for(u32 j = 0; j < B.size(); j++){
      if(j & i){
        B[j - i] |= B[j];
      }
    }
  }
  for(u32 j = 0; j < B.size(); j++){
    B[j] |= B[j] >> 32;
    B[j] |= (B[j] >> 16) & 0x0000FFFF0000FFFF;
    B[j] |= (B[j] >> 8) & 0x00FF00FF00FF00FF;
    B[j] |= (B[j] >> 4) & 0x0F0F0F0F0F0F0F0F;
    B[j] |= (B[j] >> 2) & 0x3333333333333333;
    B[j] |= (B[j] >> 1) & 0x5555555555555555;
  }
}

int main(){
  u32 n;
  scanf("%u", &n);
  for(u32 i = 0; i < n; i++){
    u32 a;
    scanf("%u", &a);
    set(B, a);
  }
  zeta(B);
  u32 ans = 0;
  for(u32 i = 0; i < B.size(); i++){
    ans += __builtin_popcountll(B[i]);
  }
  printf("%u\n", ans);
  return 0;
}