package main

import (
	"bufio"
	"fmt"
	"os"
)

func stdin() (inputs []string) {
	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		inputs = append(inputs, scanner.Text())
	}
	return
}

// Run is a main process
func Run(inputs []string) string {
	return fmt.Sprintln("Hello World!")
}

func main() {
	p := stdin()
	fmt.Println(Run(p))
}