using System;

public class Program

{

    static bool KiemtraSNTo(int n)

    {

        bool KQ=true;

        if(n<2) KQ=false;

        for(int i=2;i<=n/2;i++)

            if(n%i==0)

            {

                KQ=false;

                break;

            }

        return KQ;

    }

    static int UocSoChungLonNhat(int a, int b)

    {

        while(a*b!=0)

        {

            if(a>b)

            {

                a = a - b;

            }

            else

            {

                b = b - a;

            }

        }

        return (a+b);   

    }

    public static void Main()

    {

        Console.WriteLine(UocSoChungLonNhat(33,11));

    }

}