# Python 2.x

import turtle
from random import *
from math import *
from time import *

def printf(f):
 global z
 turtle.goto(f.real * 20, f.imag * 20)
 print("f(" + str(z) + ") = " + str(f))
 z += d

def format(s):
 s = s.replace("^","**")
 return s

def evale(s):
 n = eval(s)
 return n

delay = input("delay = ") * 1e-3
turtle.setup(1280, 720)
turtle.speed(10)
turtle.pensize(2)
turtle.goto(-640, 0)
turtle.goto(640, 0)
turtle.goto(0, 0)
turtle.goto(0, 360)
turtle.goto(0, -360)
turtle.goto(0, 0)

while True:
 express = format(raw_input("f(z) = "))
 d = input("d = ")
 min = input("min = ")
 max = input("max = ")
 z = min
 f = evale(express)
 turtle.pencolor(random(), random(), random())
 turtle.penup()
 printf(f)
 turtle.pendown()

 while z < max:
 f = evale(express)
 printf(f)