# Aamrun, 11th July 2022
def F(n,x,y):
if n==0:
return x + y
elif y==0:
return x
else:
return F(n - 1, F(n, x, y - 1), F(n, x, y - 1) + y)
print("F(1,3,3) = ", F(1,3,3))