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.
#maximum
n =input()
l =len(n)
n = int(n)

def dekh(x):
   # if(x ==0 ):
    #    return 0
    if(x == 1):
        return 9
    x1 =0
    for i in range(1,x):
        x1 = x1 + 9*i*(10**(i-1))
    return x1

ans = dekh(l)

ans = ans + (n - 10**(l-1) + 1)*l
print(ans)