import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No221 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));

            // 入力
            double N = Double.parseDouble(br.readLine());

            // Y市全体の構成員
            double member = 100 * N;
            
            //Y市全体の一般市民数
            double citizen = 1000000 - member;
            
            //構成員で逮捕される者の数
            double arrestedMenber = member * 0.99;
            
            //一般市民で逮捕される者の数
            double arrestedCitizen = citizen * 0.01;
            
            //逮捕者総数
            double arrestedPeople = arrestedMenber + arrestedCitizen;
            
            //誤認逮捕率
            double ans = arrestedCitizen / arrestedPeople * 100;
            
            System.out.println(ans);
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

}