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=input()
k=len(n)
x=0
t=[]
for i in range(11):
    x+=9*(10**(i-1))*i 
    t.append(int(x))
#print(t)    
p=str(int(n)-(10**(k-1))+1) 
ans=t[k-1]+int(p)*(k)
print(int(ans))
