#include <bits/stdc++.h>
using namespace std;
#define int long long
#define f first
#define ss second
#define ina insert
#define pb push_back
signed main(){
int n;
cin>>n;
int x[n];
set<int>s;
map<int,vector<int>>mp;
for(int i=0; i<n; i++){
cin>>x[i];
s.ina(x[i]);
mp[x[i]].pb(i);
}
int ans=1;
set<int>bati;
for(auto a:s){
int di=0,ri=0;
for(auto b:mp[a]){
// if(bati.find(b-1)==bati.end())di=1;
// if(bati.find(b+1)==bati.end())ri=1;
// if(di && ri){
// bati.ina(b);
// }
// else{
// if(di!=1 && ri!=1){
// }
// }
bati.ina(b);
}
int l=0;
int ixvi=-1;
//cout<<a<<endl;
for(auto b:bati){
if(ixvi!=-1){
if(b==ixvi+1){
//ixvi=b;
//continue;
}
else{
l++;
}
}
else{
l++;
}
//cout<<b<<" "<<ixvi<<endl;
ixvi=b;
}
//cout<<l<<endl;
//int k=bati.size()+1;
if(bati.find(n-1)==bati.end())l++;
ans=max(l,ans);
}
cout<<ans<<endl;
}
