풀이_03

def main():
    while True:
        num = int(input("정수 입력:  "))
        if 3 <= num <= 20:
            if num%2 == 1:
                break
            else:
                print ("even number no!!!")
        else:
            print ("3 ~ 21")

    for i in range(0, num):
        """
        3 => (0, 1) : 3
        5 => (0, 2) : 5
        7 => (0, 3) : 7
        9 => (0, 4) : 9
        """
        if i == 0 or i == num//2:
            print ("*"*num)
        else:
            print ("*")
if __name__ == "__main__":
    main()