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=int(input())
p=n
i=1
l=1
sd=0
s=0
j=1
while(n>9):
    n=n/10
    i*=10
    l+=1
if p>9:
    while i!=1:
        s=p-i
        if j==1:
            s+=1
        sd+=s*l
        p=i
        i=i/10
        l-=1
    p=9
print(p+sd)