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)
m=len(s)
d=int(s[0])
ans=0
for i in range(m-1):
    ans+=9*10**i*(i+1)
ans+=(d-1)*10**(m-1)*m
ans+=(n-d*10**(m-1)+1)*m
print(ans)
