#!/usr/bin/env python3
# †
def f(a, b):
    integer, rem = divmod(a, b)
    v = []
    while rem:
        rem *= 10
        quo, rem = divmod(rem, b)
        v.append(quo)
    res = str(integer) + '.' + ''.join(map(str, v))
    return res


###
if __name__ == '__main__':
    k = int(input())
    s = ''.join(map(str, range(1, 101)))
    n = len(s)
    nume = int(s) * k
    deno = 10**n
    res = f(nume, deno)
    print(res)