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:
    m=str(n)
    v=m[0]+(len(m)-1)*'0'
    m=m[1:]
    b=int(m)
    b=(len(m)+1)*b
    v=int(v)
    i=len(m)
    t=i+b+10
    while v!=10:
        t+=((v-(v/10))*i)
        i-=1
        v/=10
    print(int(t))    
    
    