251102
# 조건문
#
# if 조건식 :
# 명령
# if 어쩌구 :
# 명령
# elif 조건식 :
# 명령
# else :
# 명령
# a, b, c = input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# if a>170 and b>170 and c>170 :
# print('PASS')
# else :# 조건문
# #
# # if 조건식 :
# # 명령
# # if 어쩌구 :
# # 명령
# # elif 조건식 :
# # 명령
# # else :
# # 명령
# # a, b, c = input().split()
# # a = int(a)
# # b = int(b)
# # c = int(c)
# # if a>170 and b>170 and c>170 :
# # print('PASS')
# # else :
# # print('CRASH')
# # a, b, c = input().split()
# # a = int(a)
# # b = int(b)
# # c = int(c)
# # if a>b and a>c :
# # if b>c :
# # print(c, b, a)
# # else :
# # print(b, c, a)
# # elif b>a and b>c :
# # if a>c :
# # print(c, a, b)
# # else :
# # print(a, c, b)
# # elif c>a and c>b :
# # if a>b :
# # print(b, a ,c )
# # else :
# # print(a, b, c)
# # elif a==b and a>c :
# # print(c, a, b)
# # elif b==c and b>a :
# # print(a, b, c)
# # elif a==c and a>b :
# # print(b, a, c)
# # elif a==b and b==c :
# # print(a, b, c)
# # a = int(input())
# # if a%7==6 or a%7==0 :
# # print('주말')
# # else :
# # print('주중')
# # a = int(input())
# # if a>0 :
# # print('양수')
# # elif a<0 :
# # print('음수')
# # else :
# # print(0)
# # a = int(input())
# # if a<=10 :
# # print('정상')
# # elif a>10 and a<=20 :
# # print('과체중')
# # else :
# # print('비만')
# # a, b = input().split()
# # a = int(a)
# # b = int(b)
# # max = float(a+b)
# # if max < a-b :
# # max = a-b
# # if max < b-a :
# # max = b-a
# # if max < a * b :
# # max = a * b
# # if max < a/b :
# # max = a/b
# # if max < b/a :
# # max = b/a
# # if max < a**b :
# # max = a**b
# # if max < b**a :
# # max = b**a
# # print('%.6f' %max)
# # a, b, c = input().split()
# # a = int(a)
# # b = int(b)
# # c = int(c)
# # if a < b - c :
# # print('advertise')
# # elif a > b - c :
# # print('do not advertise')
# # else :
# # print('does not matter')
#
# '''
# 조건문 (11.02)
# 반복문
# 리스트
# +다차원리스트
# 함수 + 재귀
# 클래스 + 상속
# '''
#
# '''
# 반복문 ( for, while)
#
# while 조건식 :
# 명령
# if 어쩌구 :
# break
# if 어쩌구 :
# continue
#
# for i in [5,1,2,7] :
#
# range
#
# range(4) 0이상 4미만 1간격 [0,1,2,3]
# range(2,7) 2이상 7미만 1간격 [2,3,4,5,6]
# range(2,7,2) 2이상 7미만 2간격 [2,4,6]
#
# range(a, b, c) a에서 시작해서 c씩 더해가면서 b가 아닐동안
# range(5,0,-1) 5이하 0초과 -1간격 [5,4,3,2,1]
#
# '''
# # for i in [0,1,2,3,4] :
# # for i in range(5) :
# # a, b, c, n = map(int, input().split())
# # for i in range(n-1):
# # a=a*b+c
# # print(a)
# # a = int(input())
# # k = 0
# # for i in range(1, a+1) :
# # if i%2==0 :
# # k += i
# # print(k)
# # a = int(input())
# # for i in range(1, a+1) :
# # if i%10==3 or i%10==6 or i%10==9 :
# # print("X", end=' ')
# # else :
# # print(i, end=' ')
# a = int(input())
# print('CRASH')
# a, b, c = input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# if a>b and a>c :
# if b>c :
# print(c, b, a)
# else :
# print(b, c, a)
# elif b>a and b>c :
# if a>c :
# print(c, a, b)
# else :
# print(a, c, b)
# elif c>a and c>b :
# if a>b :
# print(b, a ,c )
# else :
# print(a, b, c)
# elif a==b and a>c :
# print(c, a, b)
# elif b==c and b>a :
# print(a, b, c)
# elif a==c and a>b :
# print(b, a, c)
# elif a==b and b==c :
# print(a, b, c)
# a = int(input())
# if a%7==6 or a%7==0 :
# print('주말')
# else :
# print('주중')
# a = int(input())
# if a>0 :
# print('양수')
# elif a<0 :
# print('음수')
# else :
# print(0)
# a = int(input())
# if a<=10 :
# print('정상')
# elif a>10 and a<=20 :
# print('과체중')
# else :
# print('비만')
# a, b = input().split()
# a = int(a)
# b = int(b)
# max = float(a+b)
# if max < a-b :
# max = a-b
# if max < b-a :
# max = b-a
# if max < a * b :
# max = a * b
# if max < a/b :
# max = a/b
# if max < b/a :
# max = b/a
# if max < a**b :
# max = a**b
# if max < b**a :
# max = b**a
# print('%.6f' %max)
# a, b, c = input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# if a < b - c :
# print('advertise')
# elif a > b - c :
# print('do not advertise')
# else :
# print('does not matter')
'''
조건문 (11.02)
반복문
리스트
+다차원리스트
함수 + 재귀
클래스 + 상속
'''
'''
반복문 ( for, while)
while 조건식 :
명령
if 어쩌구 :
break
if 어쩌구 :
continue
for i in [5,1,2,7] :
range
range(4) 0이상 4미만 1간격 [0,1,2,3]
range(2,7) 2이상 7미만 1간격 [2,3,4,5,6]
range(2,7,2) 2이상 7미만 2간격 [2,4,6]
range(a, b, c) a에서 시작해서 c씩 더해가면서 b가 아닐동안
range(5,0,-1) 5이하 0초과 -1간격 [5,4,3,2,1]
'''
# for i in [0,1,2,3,4] :
# for i in range(5) :
# a, b, c, n = map(int, input().split())
# for i in range(n-1):
# a=a*b+c
# print(a)
# a = int(input())
# k = 0
# for i in range(1, a+1) :
# if i%2==0 :
# k += i
# print(k)
# a = int(input())
# for i in range(1, a+1) :
# if i%10==3 or i%10==6 or i%10==9 :
# print("X", end=' ')
# else :
# print(i, end=' ')
a = int(input())