a=input('please input your salary:')

purchase=[]

while True:

    products=[[1,'iphone',5800],[2,'book',50],[3,'bike',800],[4,'coffee',40]]

    for i in products:

        print i

    b=raw_input('please input the thing what you want buy(put Q or q to end):')

    if b.upper()=='Q':

        break

    elif products[int(b)-1][2]>a:

        print 'your money is not enough,choose other'

    else:

        a=a-products[int(b)-1][2]

        purchase.append(products[int(b)-1])

print 'the next is what you have bought:'

print 'your balance is %s'%a

for i in purchase:

    print i