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())
li=[]
while n>0:
    li.append(n%10)
    n=n//10
ans=0
t=0
if len(li)==1:
    print(li[0])
else:
    for i in range(len(li)):
        if i==0:
            ans+=9
            t+=li[i]
        else:
            t+=10*li[i]
            x=10**(i)
            x-=1
            ans+=(t-x)*(i+1)
    # print(t)
    print(ans)