import java.util.*;

public class Solver {

	public static void main(String[] args) {
		Scanner cin = new Scanner(System.in);
		int a,b;

		while(cin.hasNext())
		{
			a=cin.nextInt();
			b=cin.nextInt();
			while(a*b!=0)
				{
					if(a>b)
					{
						a%=b;
					}
					else
					{
						b%=a;
					}
				};
			System.out.println(a+b);
		}
	}
}