using System;

public class Program

{

    public static void Main()

    {

        int a = int.Parse(Console.ReadLine());

        int b = int.Parse(Console.ReadLine());

        int c = int.Parse(Console.ReadLine());

        int N1 = NOD(a,b);

        int N2 = NOD(N1,c);

        Console.WriteLine("NOD = " + N2);

    }

    static int NOD(int a,int b)

    {

        int c = 0;

        if( b>a)

        {

            c = a;

            a = b;

            b = c;

        }

        while(b != 0)

        {

            c = a % b;

            a = b;

            b = c;

        }

        return a;

}

}