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.
# RawCoder : https://clck.ru/S8wGG

n = int(input()) 
if(n <= 9):print(n)
else:
    le = len(str(n))
    s = ""
    req = 0
    for k in range(1,le):
        s += str(k)
    print((n * le) - (int(s)*9))