using System;

public class Program

{

    public static void Main()

    {

        float sum = 0;

        Console.WriteLine("total student in class : ");

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

        for(int x = 1; x <= student; x++)

        {

            Console.WriteLine("Input score of student {0} : ",x);

            float score = float.Parse(Console.ReadLine());

            sum += score;

        }

        Console.WriteLine("Total score of student = {0}",sum);

​

    }

}