A positive integer N is passed as the input. If we print all the numbers from 1 to N continuosly, the program must find the number of characters(digits) C printed and print the count C as the output.

Input Format:
The first line contains N.

Output Format:
The first line contains C.

Boundary Conditions:
1 <= N <= 9999999

Example Input/Output 1:
Input:
2

Output:
2

Explanation:
We print 12 and hence the total number of characters is 2.

Example Input/Output 2:
Input:
15

Output:
21

Explanation:
We print 123456789101112131415 and hence the total number of characters is 21.

n=int(input())
s=""
for i in range(1,n+1):
    s+=str(i)
print(len(s))
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