<?php 
    $user_input = ""; 
// Sample input - replace this with actual user input in a real scenario
$user_input = 2; // Example value, replace it with dynamic input if needed

// Convert user input to an integer
$N = intval($user_input);

// Check if the number is positive
if ($N > 0) {
    // Print the first 3 multiples of the given number N
    echo ($N * 1) . " " . ($N * 2) . " " . ($N * 3);
} else {
    echo "Please provide a positive integer.";
}
?>