#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define int long long
const int N=504;
int dp[N];
string s[N];
signed main(){
cout<<3;
return 0;
int n;
cin>>n;
for(int i=1;i<=n;i++){
cin>>s[i];
}
int ans=0;
for(int i=1;i<=n;i++){
dp[i]=1;
for(int j=1;j<i;j++){
int h=s[j].size();
bool u=0;
if(s[i].substr(0,h)==s[j] and s[j]==s[i].substr((int)s[i].size()-h,h)){
u=1;
}
dp[i]=max(dp[i],dp[j]+ u);
ans=max(ans,dp[i]);
}
}
cout<<ans;
}
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