using System;
public class Program
{
public static void Main()
//Ochoa Luna Carlos Damiann 3A TPR
//P0224
int N,suma,x;
suma=0;
System.Console.WriteLine("Dame N numeros a suma");
N=int.Parse(System.Console.ReadLine());
for(x=1;x<=N; x++)
suma=suma+x;
}
Console.Write("suma "+suma);