using System;

public class Program
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());

		int[] array = new int[n];

		for (int i = 0; i<n;i++) {
			array[i]=int.Parse(Console.ReadLine());
		}

		for (int i = 1; i < n; i++) {
			while (array[i]%array[i-1]!=0) {
				if (array[i]>array[i-1]) {
					array[i] -= array[i-1];
				}
				else {
					array[i-1] -= array[i];
				}
			}

			if (array[i-1]<array[i]) {
				array[i] = array[i-1];
			}
		}

		Console.WriteLine(array[n-1]);
	}
}