# your code goes here
def f(a, b)
if a == 0
b + 1
elsif b == 0
f(a - 1, 1)
else
f(a - 1, f(a, b - 1))
end
end
print f(3, 3)
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCmRlZiBmKGEsIGIpCglpZiBhID09IDAKCQliICsgMQoJZWxzaWYgYiA9PSAwCgkJZihhIC0gMSwgMSkKCWVsc2UKCQlmKGEgLSAxLCBmKGEsIGIgLSAxKSkKCWVuZAplbmQKCnByaW50IGYoMywgMyk=