while True: try: a, b = map(int, input().split()) mat1 = [] mat2 = [] for _ in range(a): mat1.append(list(map(int, input().split()))) for _ in range(a): mat2.append(list(map(int, input().split()))) simi = 0 for i in range(a): for j in range(b): if mat1[i][j] == mat2[i][j]: simi += 1 print(f"{(simi / (a * b)) * 100:.2f}") except: break