#include <bits/stdc++.h>
#define ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 2e6+5;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
string s;
map<ll, ll> mp;
ll pw[MAXN];
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);cout.tie(nullptr);
#ifdef Local
freopen("../IO/int.txt","r",stdin);
freopen("../IO/out.txt","w",stdout);
#endif
cin>>n;
pw[0] = 1;
for(int i = 1; i < MAXN; i++){
pw[i] = pw[i - 1]*37%mod;
}
ll ans = 0;
for(int i = 0; i < n; i++){
cin>>s;
ll hash = 0;
for(int j = 0; j < (int)s.length(); j++){
hash += (int)(s[j] - 'A' + 1)*pw[j];
hash %= mod;
}
ll cur = mp[hash];
//cout<<i<<" "<<hash<<endl;
ll curH = 0;
for(int l = 0; l < (int) s.length() - 1; l++){
curH += pw[l]*((int)(s[l] - 'A' + 1));
curH %= mod;
//cout<<l<<" ";
//cout<<curH<<endl;
//cout<<mp[curH]<<endl;
mp[hash] = max(mp[hash], mp[curH] + 1);
}
mp[hash] = max(mp[hash], cur + 1LL);
//cout<<mp[hash]<<endl;
ans = max(ans, mp[hash]);
}
cout<<ans<<endl;
#ifdef Local
cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
#endif
}
