static void Main(string[] args)
{
    int n;
    Console.Write("Ingrese N:");
    n = int.Parse(Console.ReadLine());
    Console.WriteLine("Los múltiplos de 5 son:\n");
    for (int i = 1; i <= n; i++)
    {
        if (i % 5 == 0)
        {
            Console.Write(i + ", ");
        }
    }
    Console.ReadKey();
}

This C# program prompts the user to input a number \( n \). It then calculates and displays all the multiples of 5 from 1 to \( n \). Here’s a breakdown of how the code works:

### Code Breakdown:

1. **Input from User:**
   ```csharp
   Console.Write("Ingrese N:");
   n = int.Parse(Console.ReadLine());
   ```
   - The program asks the user to enter a value for \( n \).
   - `int.Parse(Console.ReadLine())` converts the string input from the user into an integer and stores it in the variable `n`.

2. **Finding Multiples of 5:**
   ```csharp
   for (int i = 1; i <= n; i++)
   {
       if (i % 5 == 0)
       {
           Console.Write(i + ", ");
       }
   }
   ```
   - A `for` loop iterates from 1 through \( n \).
   - Inside the loop, the program checks if the current number \( i \) is a multiple of 5 using the condition `i % 5 == 0`.
   - If true, the number is printed to the console followed by a comma.

3. **End of Program:**
   ```csharp
   Console.ReadKey();
   ```
   - The program waits for the user to press a key before closing, allowing the user to see the output.

### Sample Output:

If the user inputs `n = 20`, the output will be:

```
Los múltiplos de 5 son:
5, 10, 15, 20,
```

### Would you like more details or have any questions?

### Related Questions:
1. How can you modify the program to include multiples of another number besides 5?
2. How can you alter the code to output the multiples in reverse order?
3. How could you improve the program to handle invalid inputs (e.g., non-integer values)?
4. What changes are needed to separate the last number from the trailing comma?
5. How could you adjust the program to output the sum of all the multiples found?

### Tip:
When handling user inputs, always consider adding input validation to prevent errors or unexpected behavior.

Learn how to find multiples of 5 with a basic arithmetic problem solution. This program calculates multiples of 5 up to a user-defined number, demonstrating fundamental arithmetic operations. Suitable for students in Grades 3-5.

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