function solve(input) {
    let days = Number(input.shift()) - 1
    let room = input.shift()
    let grade = input.shift()
    let price = 0

    let roomforonepersonprice = 18.00
    let apartmentprice = 25.00
    let presidentapartmentprice = 35.00

    if (room == "room for one person") {
        if (days < 10) {
            price = roomforonepersonprice
        } else if (days >= 10 && days <= 15) {
            price = roomforonepersonprice
        } else if (days > 15) {
            price = roomforonepersonprice
        }
    }
    if (room == "apartment") {
        if (days < 10) {
            price = apartmentprice * 0.70
        } else if (days >= 10 && days <= 15) {
            price = apartmentprice * 0.65
        } else if (days < 15) {
            price = apartmentprice * 0.50
        }
    } if (room == "president apartment") {
        if (days < 10) {
            price = presidentapartmentprice * 0.90
        } else if (days >= 10 && days <= 15) {
            price = presidentapartmentprice * 0.85
        } else if (days > 15) {
            price = presidentapartmentprice * 0.80
        }
    }

    if(grade == "positive"){
        finalprice = ((price + price * 0.25) * days).toFixed(2)
    }else if(grade == 'negative'){
        finalprice = ((price - price * 0.10) * days).toFixed(2)
    }

    console.log(finalprice)
}