function solve(input) {
    let km = Number(input.shift());
    let time = input.shift();

    let taxiPrice = 0.70 + 0.79 * km;
    let taxiPriceNigt = 0.70 + 0.90 * km;
    let busPrice = 0.09 * km;
    let trainPrice = 0.06 * km;

    if (time === "night"){
        if (km < 20) {
            console.log(taxiPrice.toFixed(2));
        }else if (km < 100){
            console.log(busPrice.toFixed(2));
        }else{
            console.log(trainPrice.toFixed(2));
        }

    }else{
        if(km < 20 ){
            console.log(taxiPriceNigt.toFixed(2));
        }else if(km < 100){
            console.log(busPrice.toFixed(2));
        }else{
            console.log(trainPrice.toFixed(2));
        }
    }
}