f

def f(m,n):
    if m == 0:
        return (n+1)
    if m>0 and n == 0:
        return f(m-1,1)
    if m>0 and n>0:
        return f(m-1,f(m,n-1))
m = int(input())
n = int(input())
print(f(m,n))