Sum of digits of a number

Kotlin Easy math

Task «Sum of digits of a number»

Write a program that calculates the sum of digits of a positive integer. The number can be large, up to 10^9. If the number is a single digit, the sum is equal to the number itself. Output the result.

Input Format

In a single line, an integer N (1 ≤ N ≤ 10^9) is entered.

Output Format

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

Examples

Example 1

INPUT

1000

OUTPUT

1

Example 2

INPUT

5

OUTPUT

5

main.kt