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.
list = [9, 99 , 999, 9999, 99999, 999999, 9999999, 99999999, 999999999]
n = int(input())
c = 0
for i in list:
    if n>i:
        c+=1
    else:
        break
r = 0
for i in range(c+1):
    # print(i)
    if n>list[i]:
        n-=list[i]
        r +=list[i]
    else:
        r += (i+1)*n
    # print(n,r)
print(r)