function holiday(input)
{
    let days=Number(input.shift());
    let room=input.shift();
    let grade=input.shift();

    let room_for_one_person=18.0;
    let apartment=25.0;
    let president_apartment=35.0;
    let total=0;

    let nights=days-1;
    if(days<10)
    {
        if(room=="room_for_one_person")
        {
            total=18*nights;
        }
        else if(room=="apartment")
        {
            total=(25*nights)-(0.3*(25*nights));
        }
        else if(room=="president apartment")
        {
            total=(35*nights)-(0.1*(35*nights));
        }
    }
    else if(days>=10 && days <=15)
    {
        if(room=="room_for_one_person")
        {
            total=18*nights;
        }
        else if(room=="apartment")
        {
            total=(25*nights)-(0.35*(25*nights));
        }
        else if(room=="president apartment")
        {
            total=(35*nights)-(0.15*(35*nights));
        }
    }
    else if(days>15)
    {
        if(room=="room for one person")
        {
            total=18*nights;
        }
        else if(room=="apartment")
        {
            total=(25*nights)-(0.5*(25*nights));
        }
        else if(room=="president apartment")
        {
            total=(35*nights)-(0.2*(35*nights));
        }
    }
    if(grade=="positive")
    {
        let new_total= total+(total*0.25);
        console.log(new_total.toFixed(2));
    }
    else if(grade=="negative")
    {
        let new_total=total-(total*0.1);
        console.log(new_total.toFixed(2));
    }


}