using System;

​

public class Program

{

    public static int hcf(int num1, int num2, int num3)

    {

        int small = smallest(num1, num2, num3);

        for (int divisor = small; divisor >= 1; divisor--)

        {

            if (num1 % divisor == 0 && num2 % divisor == 0 && num3 % divisor == 0)

                return divisor;

        }

​

        return 0;

    }

​

    public static int largest(int num1, int num2, int num3)

    {

        int large;

        if (num1 > num2 && num1 > num3)

            large = num1;

        else if (num2 > num1 && num2 > num3)

            large = num2;

        else

            large = num3;

        return large;

    }

​

    public static int smallest(int num1, int num2, int num3)

    {

        int small;

        if (num1 < num2 && num1 < num3)

            small = num1;

        else if (num2 < num1 && num2 < num3)

            small = num2;

        else

            small = num3;

        return small;

    }

​

    public static void Main()

    {

        int p = hcf(30, 20, 50);

        Console.WriteLine(p);

    }

}