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.
a=int(input())
b=0
l=len(str(a))
if l>1:
    for i in range(l-1):
        b=b+9*(10**i)*(i+1)
    b=b+(a-int("9"*(l-1)))*l
else:
    b=a
print(b)