#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,m,a[1000][1000],d[300][800],c;
	cin>>n>>m;
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    	 cin>>a[i][j];
		}
	}
	for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    	 cin>>d[i][j];
		}
	}
	for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    	 if(a[i][j]==d[i][j]) c++;
 }
 float s=c*1.0/(n*m)*100; printf("%.2f",s);
 
 }
}
                                                         
/**************************************************************
	Problem: 1407
	User: lidongcheng
	Language: C++
	Result: Wrong Answer
****************************************************************/