#!/usr/bin/python
# -*- coding: utf-8 -*-

N = float(input())

all = 1000000
criminal = 100 * N
innocent = all - criminal

# 対象がマフィアで逮捕 → ok
arrest_ok = (criminal / all) * 0.99
# 対象がパンピーで逮捕 → 人権侵害
arrest_mis = (innocent / all) * 0.01
# 対象がマフィアで不逮捕 → 治安悪化
(criminal / all) * 0.01
# 対象がパンピーで不逮捕 → ok
(innocent / all) * 0.99

print 100 * arrest_mis / (arrest_ok + arrest_mis)