#include<bits/stdc++.h>
using namespace std;
int n,cnt1,cnt2,cnt3,cnt4=0;
char a[20][20],b[20][20];
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)cin>>a[i][j];
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)cin>>b[i][j];
	
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			if(b[i][j]!=a[n+1-j][i]) cnt1++;
			if(b[i][j]!=a[j][n+1-i]) cnt2++;
			if(b[i][j]!=a[n+1-i][n+1-j]) cnt3++;
			if(a[i][j]!=b[i][j]) cnt4++;
		}
	}
	if(cnt1==0) cout<<"1";
	else if(cnt2==0) cout<<"2";
	else if(cnt3==0) cout<<"3";
    else if(cnt4==0) cout<<"4";
    else cout<<"5";
}