from sys import setrecursionlimit
setrecursionlimit(1000000)
def ackmann(m,n):
    if m == 0:
        return n+1
    if m>0 and n == 0:
        return ackmann(m-1,1)
    if m > 0 and n > 0:
        return ackmann(m-1,ackmann(m,n-1))


x,y = map(int,input().split())
print(ackmann(y,x))