int maxPrice = -1;
    for(int i=keyboards.length-1; i>=0; i--) {
        int keyboardprice = keyboards[i];
        for(int j=drives.length-1; j>=0; j--) {
            int driveprice = drives[j];
            if(keyboardprice + driveprice <= b) {
                if(keyboardprice + driveprice > maxPrice) {
                    maxPrice = keyboardprice + driveprice;
                }
            }
        }
    }
    return maxPrice;