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=input()
s=0
x=len(n)+((len(n)*(int(n)-(pow(10,len(n)-1)))))
for i in range(len(n)-1,1,-1):
    s+=(i)*((pow(10,i)-pow(10,i-1)))
print(s+9+x)
