module main;
// https://yukicoder.me/problems/no/221/editorial より
import std;

void main()
{
	// 入力
	int N = readln.chomp.to!int;
	// 答えの計算
	double criminal = 100.0 * N;
	double citizen = 1_000_000 - criminal;
	double arrestedCriminal = criminal * 0.99;
	double arrestedCitizen = citizen * 0.01;
	// 答えの出力
	writefln("%.12f", 100 * arrestedCitizen / (arrestedCriminal + arrestedCitizen));
}