#include <bits/stdc++.h>
#include <bitset>
using namespace std;
#define int long long
#define dd double
#define ld long double
#define ull unsigned long long
#define yes cout << "YES\n"
#define no cout << "NO\n"
#define el "\n"
#define Arwa ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define fix(x) cout << fixed << setprecision(x)
#define all(v) v.begin(),v.end()
#define dpp(arr,val) memset(arr,val,sizeof(arr))
#define mod 1e9+7
const int N = 1e5 + 5;
//  First power of two ≥ n
int powerOf2GreaterThanOrEqual(int n)
{
    int indx = 0;
    while ((1 << indx) < n)
        indx++;
    return (1 << indx);
}
//todo اى ويل بريبير ماى بيبرز تو بى ذا بيست ان زيس وورلد
void HereWeGoAgain()
{
    int n;
    cin>>n;
    int arr[n];
    for(int i=0;i<n;i++) cin>>arr[i];
    if(n<=1)
    cout<<n<<el;
    else
    {
    int or2=arr[0];
    for(int i=0;i<n;i++) or2|=arr[i];
    int mnlen=n,l=0,orr=arr[0];
    for(int i=1;i<n;i++)
    {
      orr|=arr[i]; 
      while(i>l && (arr[l]&arr[i])==arr[l])
      {
        l++;
      }
      if(orr==or2) {
        mnlen=min(mnlen,i-l+1);
      }
    }
    cout<<mnlen;
    }
 
}
int32_t main() 
{
 
    Arwa
    int t=1;
    //cin>>t;
    for(int i=1;i<=t;i++)
    {
    HereWeGoAgain();
    }
    return 0;
}
 
 

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