num = eval(input("请输入幸运数字"))
# if num == '1':
#     print("中奖啦！")
# else:
#     print("没有中奖！")
# print("真棒！") if num>100 else print(num)
# if num>=100:
#     print("大于等于100")
# elif 90<=num<100:
#     print("90<=num<100")
# elif 80<=num<90:
#     print("80<=num<90")
# elif 70<=num<80:
#     print("70<=num<80")
# elif 60<=num<70:
#     print("60<=num<70")
# else:
#     print("hehe")
# match num:
#     case 1:
#         print(1)
#     case 2:
#         print(2)
#     case 3:
#         print(3)
#     case 4:
#         print(4)
if num>=18:
    print('18')
if num<18:
    print('19')