include[HTML_REMOVED]

using namespace std;

int N=1000010;

int main()
{
int n,q[N],i,a[N],j,ll=0;
cin>>n;
for(i=0;i[HTML_REMOVED]>q[i];
}
for(i=0,j=0;i[HTML_REMOVED]1)
{
a[q[j]]–;
j++;
}
ll=max(ll,i-j+1);

}
cout<<ll;

}