import matplotlib.pyplot as plt
def fuck(begin,xi):
	all_num = [begin]
	for i in range(1,1000):
		fuck_num = float(all_num[i-1]) * float(xi) * float((1-all_num[i-1]))
		if fuck_num <= 0:
			break
		all_num.append(float(all_num[i-1]) * float(xi) * float((1-all_num[i-1])))
	return all_num


plt.plot(fuck(eval(input("输入初始数量(0<x<1):  ")),eval(input("输入系数λ(0<λ<=4):  "))))
plt.show()