def round_to_template(num: decimal.Decimal,
example: decimal.Decimal) -> decimal.Decimal:
"""
将 num 四舍五入到 example 所在的位数
:param num:
:param example: 必须含有 1，比如 decimal.Decimal('0.01')、decimal.Decimal('0.000001000')
:return:
"""
example = str(example)
if '1' not in example:
raise ValueError('example 必须包含 1')
# 去除小数点
example = example.replace('.', '')
return round(num, example.index('1'))
from decimal import Decimal, ROUND_FLOOR
while True:
try:
a = Decimal(input())
except EOFError:
break
if 0 <= a <= 100:
a = a * 9 / 10 + 8
elif 100 < a <= 500:
a = a * 8 / 10
else:
a = a * 6 / 10
a = str(a)
try:
a = float(a[:a.index(".")+3])
except ValueError:
pass
print('${:.2f}'.format(a))
