#!/usr/bin/python

import sys
import re

x = sys.stdin.readline()

assert re.match('^(0|[1-9][0-9]{0,3})(\.[0-9]{1,3})?\n$', x)

x = float(x)
assert 0.0 <= x <= 1000.0

assert sys.stdin.readline() == ''

sys.exit(42)