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.
# coding=utf-8
n=int(input())
if n<10:
print(n)
elif n<100:
print(9+(n-9)*2)
elif n<1000:
print(189+(n-99)*3)
elif n<10000:
print(2889+(n-999)*4)
elif n<100000:
print(38889 + (n-9999)+5)
elif n <1000000:
print(488889 + (n-99999)+6)
elf n<10000000:
print(5888889 + (n-999999)*7)
elf n<100000000:
print(68888889+(n-9999999)+8)
elf n<1000000000:
print(788888889 + (n-99999999)+9)
elifn==1000000000:
print(8888888899)
			 	    	 		 	 	  			 		 		