num = \
"\
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08 \
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00 \
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65 \
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91 \
22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80 \
24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50 \
32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70 \
67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21 \
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72 \
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95 \
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92 \
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57 \
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58 \
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40 \
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66 \
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69 \
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36 \
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16 \
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54 \
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48".split(' ')

row = 0
column = 0
max_value = 0
to_up = False
to_down = False
to_right = False
to_left = False

def check_is_active(row, column) :
    global to_up, to_down, to_right, to_left
    to_up = row >= 3
    to_down = row <= 16
    to_right = column <= 16
    to_left = column >= 3

def update_max(value):
    global max_value
    if value > max_value :
        max_value = value

mat = [[0 for i in range(20)] for j in range(20)]

# rearrange elements
for index, string in enumerate(num) :
    value = int(string)
    if index >= 20 and index % 20 == 0 :
        row += 1
    column = index - (20 * row)
    mat[row][column] = value
    check_is_active(row, column)

    if value == 0 :
        pass
    else:
        if to_up :    update_max(mat[row][column] * mat[row-1][column] * mat[row-2][column] * mat[row-3][column])
        if to_down :  update_max(mat[row][column] * mat[row+1][column] * mat[row+2][column] * mat[row+3][column])
        if to_left :  update_max(mat[row][column] * mat[row][column-1] * mat[row][column-2] * mat[row][column-3])
        if to_right : update_max(mat[row][column] * mat[row][column+1] * mat[row][column+2] * mat[row][column+3])
        if to_up and to_right : update_max(mat[row][column] * mat[row-1][column+1] * mat[row-2][column+2] * mat[row-3][column+3])
        if to_down and to_right : update_max(mat[row][column] * mat[row+1][column+1] * mat[row+2][column+2] * mat[row+3][column+3])
print (max_value)