#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    int n,i,j,lmax=0,lc=1;
    char s[101][21];
    cin>>n;
    for(i=1;i<=n;i++)cin >> s[i];
    for(i=1;i<n;i++)
        if(s[i][strlen(s[i])-1]==s[i+1][1] && s[i][strlen(s[i])-2]==s[i+1][0])
           {
               lc++;
               if(lc>lmax)lmax=lc;
           }
        else lc=1;
        cout << lmax;
            cout << endl;

}