# 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))