소스 코드 제출

# def check(x,y,l):

# c=0

# global a

# if l==1:

# return 1

# for i in range(x,x+l):

# for j in range(y,y+l):

# if i==x and j==y:

# c=a[i][j]

# else:

# if c!=a[i][j]:

# return 0

# return 1

# def dfs(x,y,l):

# global n,a,b,w

# if check(x,y,l)==1:

# if a[x][y]==1:

# b=b+1

# else:

# w=w+1

# return

# nl=l//2

# dfs(x,y,nl)

# dfs(x,y+nl,nl)

# dfs(x+nl,y,nl)

# dfs(x+nl,y+nl,nl)

# n=int(input())

# a=[]

# b=0

# w=0

# for i in range(n):

# t=list(map(int,input().split()))

# a.append(t)

# dfs(0,0,n)

# print(w)

# print(b)

# def check(x,y,l):

# c=0

# global a

# if l==1:

# return 1

# for i in range(x,x+l):

# for j in range(y,y+l):

# if i==x and j==y:

# c=a[i][j]

# else:

# if c!=a[i][j]:

# return 0

# return 1

# def dfs(x,y,l):

# global n,a,b

# if check(x,y,l)==1:

# if int(a[x][y])==1:

# b.append(1)

# else:

# b.append(0)

# return

# nl=l//2

# b.append('(')

# dfs(x,y,nl)

# dfs(x,y+nl,nl)

# dfs(x+nl,y,nl)

# dfs(x+nl,y+nl,nl)

# b.append(')')

# n=int(input())

# a=[]

# b=[]

# for i in range(n):

# t=input()

# a.append(list(t))

# dfs(0,0,n)

# for x in b:

# print(x,end='')

# def kantor(x,y,l):

# global a

# if l==1:

# return

# ot=x+(l//3)

# tt=x+(l//3*2)

# for i in range(ot,tt):

# a[i]=' '

# kantor(x,ot,l//3)

# kantor(tt,y,l//3)

# while 1:

# try:

# n=int(input())

# p=pow(3,n)

# a=['-' for i in range(p)]

# kantor(0,p,p)

# for x in a:

# print(x,end='')

# print()

# except:

# break

n,d=int(input())