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())
cnt = 0
if n <= 9:
    print(n)
if n >= 9:
    cnt += 9
    if cnt < 99:
        print(cnt + 2*(n-9))
if n >= 99:
    cnt += 2*90
    if cnt < 999:
        print(cnt + 3*(n-99))
if n >= 999:
    cnt += 3*900
    if cnt < 9999:
        print(cnt + 4*(n-999))
if n >= 9999:
    cnt += 4*9000
    if cnt < 99999:
        print(cnt + 5*(n-9999))
if n >= 99999:
    cnt += 5*90000
    if cnt < 999999:
        print(cnt + 6*(n-99999))
if n >= 999999:
    cnt += 6*900000
    if cnt < 9999999:
        print(cnt + 7*(n-999999))
if n >= 9999999:
    cnt += 7*9000000
    if cnt < 99999999:
        print(cnt + 8*(n-9999999))
if n >= 99999999:
    cnt += 8*90000000
    if cnt < 999999999:
        print(cnt + 9*(n-99999999))
if n >= 999999999:
    cnt += 9*900000000
    if cnt < 9999999999:
        print(cnt + 10*(n-999999999))
if n >= 9999999999:
    cnt += 10*9000000000
    if cnt < 99999999999:
        print(cnt + 11*(n-9999999999))
if n >= 99999999999:
    cnt += 11*90000000000
    if cnt < 999999999999:
        print(cnt + 12*(n-99999999999))
