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())
if n < 10:
    print(n)
elif n < 100:
    print((n - 9) * 2 + 9)
elif n < 1000:
    n -= 9
    n -= 90
    print((n * 3) + (90 * 2) + 9)
elif n < 10000:
    n -= 9
    n -= 90
    n -= 900
    print((n * 4) + (900 * 3) + (90 * 2) + 9)
elif n < 100000:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    print((n * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)
elif n < 1000000:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    n -= 90000
    print((n * 6) + (90000 * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)
elif n < 10000000:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    n -= 90000
    n -= 900000
    print((n * 7) + (900000 * 6) + (90000 * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)
elif n < 100000000:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    n -= 90000
    n -= 900000
    n -= 9000000
    print((n * 8) + (9000000 * 7) + (900000 * 6) + (90000 * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)
elif n < 1000000000:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    n -= 90000
    n -= 900000
    n -= 9000000
    n -= 90000000
    print((n * 9) + (90000000 * 8) + (9000000 * 7) + (900000 * 6) + (90000 * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)
else:
    n -= 9
    n -= 90
    n -= 900
    n -= 9000
    n -= 90000
    n -= 900000
    n -= 9000000
    n -= 90000000
    n -= 900000000
    print((n * 9) + (900000000*9)+ (90000000 * 8) + (9000000 * 7) + (900000 * 6) + (90000 * 5) + (9000 * 4) + (900 * 3) + (90 * 2) + 9)