using System;
public class Program
{
public static void Main()
int n,i,sum=0;
Console.WriteLine("Enter a number");
n=Convert.ToInt32(Console.ReadLine());
for(i=1;i<=n;i++)
if(i%3==0||i%5==0)
sum=sum+i;
}
Console.WriteLine("The sum is {0}",sum);