include [HTML_REMOVED]
using namespace std;
const int N=100010;
int n;
int a[N],s[N];
int main ()
{
cin>>n;
for(int i =0;i[HTML_REMOVED]> a[i];
int res = 0;
for(int i= 0,j=0;i[HTML_REMOVED]1)
{
s[a[j]]–;
j++;
}
res=max(res,i-j+1);
}
cout<<res<<endl;
return 0;
}