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())
m=str(n)
v=m[0]+(len(m)-1)*'0'
m=m[1:]
b=int(m)
b=(len(m)+1)*b
v=int(v)
i=len(m)
t=i+b+10
while v!=10:
    t+=((v-(v/10))*i)
    i-=1
    v/=10
print(int(t))    
    
    