def main(): m, n = map(int, input().split()) a = 0 b = [list(map(int, input().split())) for _ in range(m)] c = [list(map(int, input().split())) for _ in range(m)] for i in range(m): for j in range(n): a += b[i][j] == c[i][j] x = a / (m * n) * 100 print(f"{x:.2f}") if __name__ == "__main__": main()