Sum Of Digits

Accept a positive integer as input and print the sum of the digits in the number.

Input

A single line containing a positive integer.

Output

A single integer: the sum of the digits of the number.

For example, if the input is 12345, the output is 15.

Your task

Write a complete program: read the input with input() and print the result with print().

Example

Input

12345

Output

15