gistfile1.cs

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            int photo = 52;
            int line = 3;
            int lineCount = photo / line;
            int photoOut = photo - lineCount * line;
            Console.WriteLine($"Рядов {lineCount}, {photoOut} фото останется");
        }
    }
}