from itertools import combinations
n, k = list(map(int, input().split()))
l, ll = [], []
for i in range(1, n + 1):
    l.append(i)
for j in combinations(l, k):
    ll.append(j)
print(len(ll))

6c7b2621fcad1354835a052c986e688c1e22eb41
<mask token>

<mask token>
for i in range(1, n + 1):
    l.append(i)
for j in combinations(l, k):
    ll.append(j)
print(len(ll))

<mask token>
n, k = list(map(int, input().split()))
l, ll = [], []
for i in range(1, n + 1):
    l.append(i)
for j in combinations(l, k):
    ll.append(j)
print(len(ll))

from itertools import combinations
n, k = list(map(int, input().split()))
l, ll = [], []
for i in range(1, n + 1):
    l.append(i)
for j in combinations(l, k):
    ll.append(j)
print(len(ll))
