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()
if len(n)==1:
    print(n)
else:
    sum=0
    for i in range(len(n)-1):
        s='9'+'0'*i

        temp=int(s)
        
        sum=sum+(temp*(i+1))
    s2='1'+'0'*(len(n)-1)
    temp2=int(s2)
    res=int(n)-temp2+1
    sum=sum+(res*len(n))
    print(sum)

