85分求条，玄关

#include<bits/stdc++.h>
using namespace std;
long long n,a[1000001],maxa=-1000,c,b=-1000;
int main(){

    cin>>n;
    for(long long i=0;i<n;i++){
        cin>>a[i];
    }
    for(long long i=0;i<n;i++){
        if(maxa<a[i]){
            maxa = a[i];
            c = i;
        }
    }
    a[c] = -1;
    for(long long i=0;i<n;i++){
        if(b<a[i]){
            b = a[i];
        }
    }
    c = (maxa&b);
    cout<<c;
    
    return 0;
}