process.stdin.resume();
process.stdin.setEncoding('utf8');

const readline = require('readline');

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

var lines = [];
r1.on("line",(line) => {
    lines.push(line);
});

r1.on("close",() => {
    console.log("Hello World!");
});