240720

# data = [[0 for i in range(26)]*26]

# for i in range(1, 10):

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

# v.insert (0, 0)

# v.append (0)

# data.append(v)

# data.append([0 for i in range(11)])

# sum = 0

# for x in range(25):

# for y in range(25):

# def life(x,y) :

# #x,y의 주변 8칸의 생명의 갯수

# global data

# global sum

# data[x][y]=1

# if data[x - 1][y - 1] == 1:

# sum += 1

# if data[x - 1][y] == 1:

# sum += 1

# if data[x - 1][y + 1] == 1:

# sum += 1

#

# if data[x][y + 1] == 1:

# sum += 1

# if data[x][y - 1] == 1:

# sum += 1

#

# if data[x + 1][y + 1] == 1:

# sum += 1

# if data[x + 1][y - 1] == 1:

# sum += 1

# if data[x + 1][y] == 1:

# sum += 1

#

# for i in range(25):

# for j in range(25):

# if life(i, j)==3 and data[i][j] == 0:

# data[i][j] = 1

# if data[i][j] == 1 and life(i, j)>=4 or life(i, j)<=1:

# data[i][j] = 0

# if data[i][j] == 1 and life(i, j) == 2 or life(i, j) == 3:

# data[i][j] = 1

#

# for i in range():

# for j in range():

# print(data[i][j], end = ' ')

# print()

# n = int(input())

# x, y = map(int, input().split())

# def f(a):

# if a>0:

# return a

# else:

# return -a

# def d(a, b):

# return f(a-x)+f(b-y)+1

#

# for i in range(1, n+1):

# for j in range(1, n+1):

# print(d(i, j), end = ' ')

# print("")

a, b = map(int, input().split())

count = 0

arr = [[0 for j in range(a+1)] for i in range(b+1)]

for i in range(1, b+1):

count = 0

if arr[i][j] == arr[i][j+1]:

count+=1

else:

print(count)