Ksusha is a beginner coder. Today she starts studying arrays. She has array *a*<sub class="lower-index">1</sub>, *a*<sub class="lower-index">2</sub>, ..., *a*<sub class="lower-index">*n*</sub>, consisting of *n* positive integers.

Her university teacher gave her a task. Find such number in the array, that all array elements are divisible by it. Help her and find the number!
The first line contains integer *n* (1 ≤ *n* ≤ 10<sup class="upper-index">5</sup>), showing how many numbers the array has. The next line contains integers *a*<sub class="lower-index">1</sub>, *a*<sub class="lower-index">2</sub>, ..., *a*<sub class="lower-index">*n*</sub> (1 ≤ *a*<sub class="lower-index">*i*</sub> ≤ 10<sup class="upper-index">9</sup>) — the array elements.
if __name__ == "__main__":
	N = int(input())
	list_n = list(map(int, input().split()))
	lis = list(dict.fromkeys(list_n))
	num = -1
	for i in range(len(lis)):
		for j in range(i + 1, len(lis)):
			if lis[j] % lis[i] == 0:
				num = lis[i]
	print(num)

	 	 		 	 						   	    	   		 	