function findCheapestNode(){

    newNodeCost = getNextHacknetNodeCost();

    cheapestOption = ["new", "", newNodeCost];
    if (hacknetnodes.length === 0){return cheapestOption;}

    lowestEarner = 0;
    for (i = 0; i < hacknetnodes.length; ++i){
        if (hacknetnodes[lowestEarner].moneyGainRatePerSecond > hacknetnodes[i].moneyGainRatePerSecond){
            hacknetnodes[lowestEarner] = i;
        }
    }
    buttons = []
    cheapestButton = [];
    leUpgrade = hacknetnodes[hacknetnodes[lowestEarner]].getLevelUpgradeCost(1);
    leRam = hacknetnodes[hacknetnodes[lowestEarner]].getRamUpgradeCost();
    leCore = hacknetnodes[hacknetnodes[lowestEarner]].getCoreUpgradeCost();

    for (i = 0; i < 3; ++i){
        if (cheapestButton < leUpgrade && (hacknetnodes[hacknetnodes[lowestEarner]].level < 200)){
            cheapestButton = ["upgrade", leUpgrade];
        } else if (cheapestButton < leRam){
            cheapestButton = ["ram", leRam];
        } else if (cheapestButton < leCore){
            cheapestButton = ["core", leCore];
        }
    }
    if (newNodeCost < cheapestButton[1]){
        return cheapestOption;
    } else {
        cheapestOption = [cheapestButton[0], hacknetnodes[lowestEarner], cheapestButton[1]]
        return cheapestOption;
    }

}
while(true){
    toPurchase = findCheapestNode();
    while (getServerMoneyAvailable("home") < toPurchase[2]){ sleep(60000);}
    if (toPurchase[0] === "new"){
        if (purchaseHacknetNode()){print("HacknetNode purchased")}
    } else if (toPurchase[0] === "upgrade"){
        toPurchase[1].upgradeLevel(1);
        print(toPurchase[1] + "'s level upgraded");
    } else if (toPurchase[0] === "ram"){
        toPurchase[1].upgradeRam();
        print(toPurchase[1] + "'s ram upgraded");
    } else if (toPurchase[0] === "core"){
        toPurchase[1].upgradeCore()
        print(toPurchase[1] + "'s core upgraded");
    }
}