Given an integer n, calculate the sum of all its digits, then multiply the result by 7.

Examples

Example 1

Input:  123
Output: 42

(1 + 2 + 3) × 7 = 6 × 7 = 42

Example 2

Input:  999
Output: 189

(9 + 9 + 9) × 7 = 27 × 7 = 189

Example 3

Input:  0
Output: 0

Constraints

• Handle single digits and multiple digits
• Non-negative integers