class ggt2{

    public static int 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;
            }
        }
}