# n = int(input())
# if n == 11 or n == 12 or n == 13:
# print(n, 'th', sep='') # + th
# elif n % 10 == 1:
# print(n, 'st', sep='') # + st
# elif n % 10 == 2:
# print(n, 'nd', sep='') # + nd
# elif n % 10 == 3:
# print(n, 'rd', sep='') # + rd
# else:
# print(n, 'th', sep='') # + th
# a, b = map(int, input().split())
# calculate = [a+b, b+a, a-b, b-a, a*b, b*a, a/b, b/a, 6 a**b, b**a]
# max = max(calculate)
# print('%.6f' % max)
# '%.6f' 소수점 6자리
# a, b = input().split()
# a = int(a)
# b = int(b)
# if a % b == 0:
# print(str(b) + '*' + str(int(a/b)) + '=' + str(a))
# elif b % a == 0:
# print(str(a) + '*' + str(int(b/a)) + '=' + str(b))
# else:
# print('none')
# n = list(map(int, input().split()))
# a = n.count(1)
# if a == 1:
# print('도')
# elif a == 2:
# print('개')
# elif a == 3:
# print('걸')
# elif a == 4:
# print('윷')
# else:
# print('모')
# menu = [0, 400, 340, 170, 100, 70]
# menu1, menu2 = input().split()
# menu1 = int(menu1)
# menu2 = int(menu2)
# a = menu[menu1] + menu[menu2]
# if a <= 500:
# print('no angry')
# if a > 500:
# print('angry')
# 400, 800, 1200, 1600, 2000, 2400, 2800 ....
# 4 8 12 16 20 24 28 32 36...."100" 104 108...200
# year, month = input().split()
# year = int(year)
# month = int(month)
# f = 0
# if year % 400 == 0 or (year % 4 == 0 and year % 100 != 0):
# f = 29
# else:
# f = 28
# if month < 8:
# if month == 2:
# print(f)
# elif month % 2 == 0:
# print('30')
# else:
# print('31')
# else:
# if month % 2 == 0:
# print('31')
# else:
# print('30')