#include<bits/stdc++.h> using namespace std; int main() { int a[100][100], b[100][100], m, n, sum = 0; 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 >> b[i][j]; if (a[i][j] == b[i][j]) sum++; } printf("%.2f", sum * 1.0 / (m * n) * 100); return 0; }