dan0nchik

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

namespace Многоугольники
{
    public partial class Form1 : Form

dan0nchik

#include <iostream>
#include <vector>
using namespace std;
int main()
{
    std::vector<int> v;
    for(int i =1390; i<12567;++i ){
        if((i%3==0 or i%5==0) and i%7!=0 and i%11!=0 and i%13!=0 and i%23!=0) v.push_back(i);
    }
    int max = 1389;

dan0nchik

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

dan0nchik

 WebRequest request = WebRequest.Create("https://api.thecatapi.com/v1/categories");
            using (var s = request.GetResponse().GetResponseStream())
            {
                using (var sr = new StreamReader(s))
                {
                    var asJSON = sr.ReadToEnd();
                    res = JsonConvert.DeserializeObject<List<CategoriesModel>>(asJSON);
                }
            }