20231126

# x = int(input())

#

# data = []

#

# for i in range(x):

#

# dt = []

#

# dt.append(int(input()))

#

# data.append(dt)

#print(data)

# for i in range(x):

#

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

#

# data[i].append(data[i][j-1]-data[i-1][j-1])

#

# for i in range(x):

#

# for j in range(0,i+1):

#

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

#

# print()

# x = int(input())

# data = []

# sum = 1

# fk = 0

#

# for i in range(x):

# da = []

#

# for j in range(0,x):

# da.append(sum)

# sum = sum + 1

# data.append(da)

#

# for i in range(0,x):

# for j in range(0,x):

# #fk = fk + data[0][j] + data[x-1][j] + data[i][0] + data[i][x-1]

# if i==0 or i == x-1 or j == 0 or j == x-1:

# fk = fk + data[i][j]

#

# print(fk)

x, y = input().split()

x = int(x)

y = int(y)

data = []

for i in range(0,x):

fk = []

for j in range(0,y):

print(i, j)

if i == 0 or j == 0:

fk.append(1)

#data.append(fk)

else:

fk.append(data[i-1][j]+fk[j-1])

data.append(fk)

print(data)

print(data[x-1][y-1])