import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(read())

A = [
    0,0,0,0,3,0,5,0,7,7, # 0 ~ 9
    7,0,11,0,13,7,7,0,8,0, # ~19
    19,19,7,0,23,23,8,8,8
]

answer = A[N] if N < 30 else 8
print(answer)