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import operator as op

from functools import reduce

def ncr(n, r):

r = min(r, n-r)

numer = reduce(op.mul, range(n, n-r, -1), 1)

denom = reduce(op.mul, range(1, r+1), 1)

return numer // denom

n,r = map(int,input().split())

print(ncr(n,r))

11

2 2 2 1

2 2 1 2

2 2 2 2

4 2 1 2

4 2 1 1

4 2 1 3

4 2 2 2

4 2 2 3

3 5 1 3

3 5 2 3

3 5 2 1