#include<bits/stdc++.h>
using namespace std;
int main(){
    int a[105][105],b[105][105],n,i,j;
    float h=0;
    cin>>n;
    for(i=0;i<n;i++){
    	for(j=0;j<n;j++){
    		cin>>a[i][j];
		} 
    }
    for(i=0;i<n;i++){
    	for(j=0;j<n;j++){
    		cin>>b[i][j];
		} 
    }
    for(i=0;i<n;i++){
    	for(j=0;j<n;j++){
    	if(a[i][j]=b[i][j]){
    	   h++;
     	}
    }
	
}
    h=h*1.00/n; 
    printf("%.2f",h);
}
/**************************************************************
	Problem: 1407
	User: lijinkai
	Language: C++
	Result: Wrong Answer
****************************************************************/