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())
if(n<10):
    print(n)
else:
    s=str(n)
    p=len(s)-1
    count=0
    while(p>0):
        s1=""
        q=p
        while(q>0):
            s1=s1+"9"
            q-=1
        r=int(s1)
        count=count+(p+1)*(n-r)
        n=r
        p-=1
    print(count+9)
