function main(lines) {
    lines = lines.map(Number);
    let sum = 0;
    for (let i = 0; i < lines.length; i++) {
        sum += lines[i];
    }
    console.log(sum);
    let sumInverse = 0;
    for (let i = 0; i < lines.length; i++) {
        sumInverse += 1 / lines[i];
    }
    console.log(sumInverse);
    lines=lines.map(String);
    let concat="";
    for (let i = 0; i < lines.length; i++) {
        concat += lines[i];
    }
    console.log(concat);
}