class ggt2{

    public static void main (String[] args){
        int a = Integer.parseInt(args[0]);
        int b = Integer.parseInt(args[1]);
        println ( "ggT = "+ euklid(a,b));
        }

    static int euklid ( int x, int y){

        while (y != 0){
            if ( x > y)
                x = x-y;
        else
            y = y-x;
        }
        return x;
        }
}