Vanya got an important task — he should enumerate books in the library and label each book with its number. Each of the *n* books should be assigned with a number from 1 to *n*. Naturally, distinct books should be assigned distinct numbers.

Vanya wants to know how many digits he will have to write down as he labels the books.
The first line contains integer *n* (1 ≤ *n* ≤ 10<sup class="upper-index">9</sup>) — the number of books in the library.
#https://codeforces.com/problemset/problem/552/B

n = input()

d = len(n)

ans = 0

while(d > 0):
    if d == len(n):
        ans += (int(n) - int("1"+"0"*(d-1)) + 1)*d
    else: 
        ans += (int("9"*d) - int("1"+"0"*(d-1)) + 1)*d
    d -= 1
print(ans)
    