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.
def populate():
    lis = []
    for i in range(1, 10):
        lis.append(i * (10**(i) - 10**(i - 1)))
    return [0] + lis


glob = populate()
n = input()
l = len(n)
print(glob[l - 1] + l * (1 + int(n) - (10**(l - 1))))