# include<iostream> # include<cmath> using namespace std; int first[101][101],second[101][101]; int n,m,Similarities; double answer; int main(){ cin>>n>>m; for(int i=0;i<n;i++){ for(int j=0;j<m;j++){ cin>>first[i][j]; } } for(int i=0;i<n;i++){ for(int j=0;j<m;j++){ cin>>second[i][j]; } } for(int i=0;i<n;i++){ for(int j=0;j<m;j++){ if(first[i][j]==second[i][j]) Similarities++; } } answer=Similarities/(n*m)*1.0; printf("%.2lf",answer); return 0; }