#!/usr/bin/env python3
# -*- coding: utf-8 -*-
d = 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495969798991
n = int(input())
d_len = len(str(d))
res_f = str(d * n)
dif = len(res_f) - d_len
if dif == 0:
    print("0." + res_f)
else:
    print(res_f[:dif] + "." + res_f[dif:])