#include<bits/stdc++.h>
#if __has_include(<atcoder/all>)
#endif
using namespace std;
#define LL(...) ll __VA_ARGS__;lin(__VA_ARGS__)
#define RDVL(T,n,...) vec<T>__VA_ARGS__;fe(refs(__VA_ARGS__),e)e.get().resizes(n);lin(__VA_ARGS__)
#define VL(n,...) RDVL(ll,n,__VA_ARGS__)
#define fe(a,e,...) for(auto&&__VA_OPT__([)e __VA_OPT__(,__VA_ARGS__]):a)
#define defpp template<ostream&o=cout>void pp(const auto&...a){[[maybe_unused]]const char*c="";((o<<c<<a,c=" "),...);o<<'\n';}void epp(const auto&...a){pp<cerr>(a...);}
#define entry defpp void main();void main2();}int main(){my::io();my::main();}namespace my{
namespace my{
void io(){cin.tie(nullptr)->sync_with_stdio(0);cout<<fixed<<setprecision(15);}
using ll=long long;
constexpr auto refs(auto&...a){return array{ref(a)...};}
void lin(auto&...a){(cin>>...>>a);}
constexpr auto abs(auto x){return x<0?-x:x;}
template<class T=ll>T pow2(ll n){return T(1)<<n;}
constexpr ll size2(auto x){x|=1;ll r=0;while(x>0)x>>=1,++r;return r;}
auto min(auto...a){return min(initializer_list<common_type_t<decltype(a)...>>{a...});}
auto binary_search(ll o,ll x,const auto&f){while(abs(o-x)>1)(f((o+x)/2)?o:x)=(o+x)/2;return o;}
template<class F=less<>>auto&sort(auto&a,F f={}){ranges::sort(a,f);return a;}
template<class...A>using pack_back_t=tuple_element_t<sizeof...(A)-1,tuple<A...>>;
}
namespace my{
template<class V>istream&operator>>(istream&i,vector<V>&v){fe(v,e)i>>e;return i;}
template<class V>constexpr int depth=0;
template<class T>struct core_t_helper{using type=T;};
template<class T>using core_t=core_t_helper<T>::type;
template<class V>struct vec;
template<int D,class T>struct hvec_helper{using type=vec<typename hvec_helper<D-1,T>::type>;};
template<class T>struct hvec_helper<0,T>{using type=T;};
template<int D,class T>using hvec=hvec_helper<D,T>::type;
template<class V>struct vec:vector<V>{
  static constexpr int D=depth<V>+1;
  using C=core_t<V>;
  using vector<V>::vector;
  void resizes(const auto&...a){if constexpr(sizeof...(a)==D)*this=make(a...,C{});else{ }}
  static auto make(ll n,const auto&...a){
    if constexpr(sizeof...(a)==1)return vec<C>(n,array{a...}[0]);
    else { }
  }
};
template<class...A>requires(sizeof...(A)>=2)vec(const A&...a)->vec<hvec<sizeof...(A)-2,pack_back_t<A...>>>;
}
namespace my{
template<class T,class F>struct priority_queue:std::priority_queue<T,vector<T>,F>{
  priority_queue(const vector<T>&a){fe(a,e)this->emplace(e);}
  ll size()const{return std::priority_queue<T,vector<T>,F>::size();}
  T pop(){T r=this->top();std::priority_queue<T,vector<T>,F>::pop();return r;}
};
template<class T>using max_heap=priority_queue<T,less<T>>;
}
namespace my{entry
void main(){
  LL(N);
  VL(N,A);
  sort(A);

  ll L=size2(A.back());
  pp(binary_search(N+L,0,[&](ll X){ // X回以下でできるか
    auto a=A;
    ll cnt=0;
    max_heap<ll>q(a);
    while(X&&q.size()){
      ll H=q.pop();
      ll t=pow2(min(L,X-1));
      X--;
      if(H>t)q.emplace(H-t);
    }
    return q.empty();
  }));
}}