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.
"""
arr = list(map(int, input().split()))
n,k=map(int, input().split())
"""
number = str(input())
digits = len(number)
number = int(number)
counter = 1
res = 0
check = 0
while counter <= digits:
    high = '9' * counter
    if number > int(high):
        res += counter * int(high)
        check = int(high)
    else:
        res += (number - check) * digits
    counter += 1
print(res)
