def main(n, m, k):
    if (m < 0): return 0
    if (n == 0): return 0
    if (not m): return 1
    p = 0
    for i in range(10):
        if (k == 1) and (i == 0): continue
        if (i > m): break
        p += main(n-1, m-i, 0)
    return p

n = int(input())
m = int(input())

if (m == 0) and (n != 0):
   print(0)
else: print(main(n+1, m, 1))