Sum of digits of a three-digit number

C# Easy math

Task «Sum of digits of a three-digit number»

Write a program that takes a three-digit integer and calculates the sum of its digits. The number can be positive or negative. It is guaranteed that the absolute value of the number is a three-digit number (from 100 to 999). The program should output the sum of the digits of this number.

Input Format

One line containing an integer n (|n| from 100 to 999).

Output Format

One integer — the sum of the digits of the number n.

Examples

Example 1

INPUT

123

OUTPUT

6

Example 2

INPUT

999

OUTPUT

27

main.cs