#include<bits/stdc++.h> using namespace std; int a[101][101]; int b[101][101]; int main(){ int n,m,x = 0; cin>>n>>m; for (int i = 0;i <= n - 1;i++){ for (int j = 0;j <= m - 1;j++){ cin>>a[i][j]; } } for (int i = 0;i <= n - 1;i++){ for (int j = 0;j <= m - 1;j++){ cin>>b[i][j]; } } for (int i = 0;i <= n - 1;i++){ for (int j = 0;j <= m - 1;j++){ if (a[i][j] == b[i][j]){ x += 1; } } } double ans = (double)x / (n * m) * 100; printf("%.2lf",ans); return 0; }