穷举

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum = 0;
            for (int i = 1; i < 100; i++)

            {
                for (int j = 1; j < 33; j++)
                {
                    for (int k = 1; k < 20; k++)
                    {
                        if (i * 2 + j * 3 + 5 * k == 100)
                        {
                            Console.Write(i);
                            Console.Write(j);
                            Console.WriteLine(k);
                            sum++;
                        }
                    }
                }
            }
            Console.WriteLine(sum);
            Console.ReadLine();
        }
    }
}