---

using System;

class Program
{
    static void Main()
    {
        int a = 5;
        int b = 12;
        int nod = 1;
        
        int i = 1;
        while (i <= a && i <= b)
        {
            if (a % i == 0 && b % i == 0)
            {
                nod = i;
            }
            i++;
        }
        
        Console.WriteLine($"НОД({a}, {b}) = {nod}");
    }
}