n = int(input())
m = int(input())
if n == 0:
    print(1 - min(1, m))
    exit()
A = [0]
P = [1]
for i in range(1, 300):
    P.append(P[-1])
    for j in range(i - 1, -1, -1):
        if j != 0:
            P[j] += P[j - 1]
    tot = sum(a * p for a, p in zip(A, P))
    A.append((pow(i, n) - tot) // P[-1])

if m >= len(A):
    print(0)
else:
    print(round(A[m]))