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.
s=input()
n=int(s)
q=len(s)
k=9
j=1
s=0
if(n<=9):
    print(n)
else:
    for i in range(1,q):
        s=s+k*j;
        j=j+1;
        k=k*10;
    w=s+(n+1-10**(q-1))*q;
    print(w)
    