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.
a=int(input())


p=0


for j in range(len(str(a)),1,-1):
    if j==len(str(a)):
        p+=  (a-int((j-1)*'9'))*j
    else:
        p+=  (int('9'*j)-int('9'*(j-1)))*j



if a>9:
    print(p+9)
else:
    print(a)
