using System;

​

public class Program

{

    public static void Main()

    {

        int num, hw, sum;

        Console.WriteLine("How much homework did the student do?");

        hw = int.Parse(Console.ReadLine());

        sum = 0;

        num = 0;

        while (sum <= 70)

        {

            if (hw > 15)

            {

                sum = sum + hw;

                num = num + 1;

            }

​

            Console.WriteLine("How much homework did the student do?");

            hw = int.Parse(Console.ReadLine());

        }

​

        Console.WriteLine("There are" + num + "who study more than 15 hours");

    }

}