Common Divisor of List

Write a function that returns the greatest common divisor of all list elements. If the greatest common divisor is 1, return 1.

Examples

GCD([10, 20, 40]) ➞ 10

GCD([1, 2, 3, 100]) ➞ 1

GCD([1024, 192, 2048, 512]) ➞ 64

Notes

• List elements are always greater than 0.
• There is a minimum of two list elements given.