import math

budget = float(input())
students = int(input())
price_pack_flour = float(input())
price_one_egg = float(input())
price_one_apron = float(input())
free_flour = len([i for i in range(1, students + 1) if i % 5 == 0]) # Тук взимам размера на листа, което реално е броя free flour
# free_flour = 0
#
# for i in range(1, students + 1):
#     if i % 5 == 0:
#         free_flour += 1

# egg_price = (price_one_egg * 10) * students
# flour_price = price_pack_flour * (students - free_flour)
# apron_price = math.ceil((price_one_apron * students) + (students * 1.2))
# all_price = apron_price + egg_price + flour_price
# needed = abs(all_price - budget)

total_price = price_one_apron * (students + math.ceil(students * 0.20)) + (price_one_egg * 10 * students) \
              + (price_pack_flour * (students - free_flour))

if total_price <= budget:
    print(f"Items purchased for {total_price:.2f}$.")

else:
    diff = abs(total_price - budget)
    print(f"{diff:.2f}$ more needed.")