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.
n = int (input())
term = 0
base = 10
for i in range (11) :
    nD = len(str(n))
    # f = -1 if n % 10 == 1 else 0
    f = -1
    if n < base :
        break
    else :
        term += (n - base)
    base *= 10
ans = term + f + nD + n
# print (term, f, nD, n)
print (ans)