# W = 2
#   1  x2
#  x3

# W = 3
#   1  x2  x3
#   4  x5
#  x7

# W = 4
#   1  x2
#  x5

# W = 5
#   1  x2
#   6  x7
# x11

# W = 6
#   1  x2
#  x7

# W = 7
#   1  x2  x3
#   8   9  10 x11
#  15  16 x17
#  22 x23
# x29 

# W = 8
#   1  x2  x3   4  x5   6  x7   8
#   9  10 x11  12 x13  14  15  16
# x17  18 x19  20  21  22 x23  24
#  25  26  27  28 x29  30 x31  32
# ................................  N >= 26 は ok

# N <= 25 の時、 

# W = 9
#   1  x2
#  10 x11
# x19

# W = 10
#   1  x2
# x11

# W = 11
#   1  x2
#  12 x13
# x23

# W = 12
#   1  x2  x3   4  x5   6  x7   8   9  10 x11  12
# x13  14  15  16 x17  18 x19  20  21  22 x23  24
#  25

def run(N) :
    if N > 25 : 
        return 8
    # N = 4,6,8,9,10,12,14,15,16,18,20,21,22,24,25
    if N == 4 :
        return 3
    if N == 6:
        return 5
    if N==8 or N == 9 or N == 10 or N == 15 or N == 16 or N == 22:
        return 7
    # N = 12,14,18,20,21,24
    if N==12:
        return 11
    if N == 14:
        return 13
    if N == 18:
        return 17
    if N== 20 or N == 21:
        return 19
    if N==24 or N == 25:
        return 23

N = int(input())
print(run(N))