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())
l=len(str(n))
#l=l-1
#yo=l-1
#ro=(10**(l-1)-1)
ro=int(((9*l-10)*(10**(l-1))+1)/9)
#print(int(ro))

if l!=1:
	yo=n-int('9'*(l-1))
else:
	yo=n
#print(yo)
yoyo=yo*l
ans=ro+yoyo
print(ans)