//
//  428.cpp
//  yukicoder
//
//  Created by KITAZUMI on 2016/11/07.
//  Copyright © 2016年 KITAZUMI. All rights reserved.
//

//#include "428.hpp"
#include<iostream>
#include<iomanip>
#include<cmath>

using namespace std;

int main(){
    long D[19];
    int N;
    long S[19];
    long A;
    long tmp;
    long keta;
    D[0] = 1234567891;
    D[1] = 111213141;
    D[2] = 5161718192;
    D[3] = 212223242;
    D[4] = 5262728293;
    D[5] = 313233343;
    D[6] = 5363738394;
    D[7] = 414243444;
    D[8] = 5464748495;
    D[9] = 515253545;
    D[10] = 5565758596;
    D[11] = 616263646;
    D[12] = 5666768697;
    D[13] = 717273747;
    D[14] = 5767778798;
    D[15] = 818283848;
    D[16] = 5868788899;
    D[17] = 919293949;
    D[18] = 5969798991;
    cin >> N;
    //S = D*N;
    A = 0;
    keta = pow(10, 10);
    for(int i = 18; i >= 0; i--){
        tmp = D[i] * N;
        S[i] = tmp % keta + A;
        A = tmp / keta;
    }
    cout << A << ".";
    for(int i = 0; i < 19; i++){
        cout << setfill('0') << setw(10) << S[i];
    }
    cout << endl;
    return 0;
}