07. Fruit Shop

<?php

$fruit = readline();
$day = readline();
$quantity = floatval(readline());

$isFruit = $fruit == 'banana' || $fruit == 'apple' || $fruit == 'grapefruit' || $fruit == 'orange' || $fruit == 'kiwi' || $fruit == 'pineapple' || $fruit == 'grapes';

$isDayofWeek = $day == 'Monday' || $day == 'Tuesday' || $day == 'Wednesday' || $day == 'Thursday' || $day == 'Friday';

$isWeekend = $day == 'Saturday' || $day == 'Sunday';

$productPrice = 0;
if ($isDayofWeek) {
    if ($fruit == 'banana') {
        $productPrice = 2.5;
    } else if ($fruit == 'apple') {
        $productPrice = 1.2;
    } else if ($fruit == 'orange') {
        $productPrice = 0.85;
    } else if ($fruit == 'grapefruit') {
        $productPrice = 1.45;
    } else if ($fruit == 'kiwi') {
        $productPrice = 2.7;
    } else if ($fruit == 'pineapple') {
        $productPrice = 5.5;
    } else if ($fruit == 'pineapple') {
        $productPrice = 3.85;
    } else if ($fruit == 'grapes') {
        $productPrice = 3.85;
    }
} else if ($isWeekend) {
    if ($fruit == 'banana') {
        $productPrice = 2.7;
    } else if ($fruit == 'apple') {
        $productPrice = 1.25;
    } else if ($fruit == 'orange') {
        $productPrice = 0.9;
    } else if ($fruit == 'grapefruit') {
        $productPrice = 1.6;
    } else if ($fruit == 'kiwi') {
        $productPrice = 3;
    } else if ($fruit == 'pineapple') {
        $productPrice = 5.6;
    } else if ($fruit == 'pineapple') {
        $productPrice = 4.20;
    }
    else if ($fruit == 'grapes') {
        $productPrice = 4.2;
    }
}

if (($isDayofWeek || $isWeekend) && $isFruit) {
    $totalPrice = $quantity * $productPrice;
    printf("%.2f", $totalPrice);
} else {
    echo 'error';
}