s = input("请输入购买笔记本的数量(多少本):")
s = int(s)
p = float(input("请输入笔记本的单价(每本多少元):"))
if s < 6:
j = 1.0
if s >= 6 and s <= 10:
j = 0.9
if s >= 11:
j = 0.8
t = s*p*j
print("总金额数为:",t,"元")