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[Home ](./index.md ) > [bitburner ](./bitburner.md ) > [Hacknet ](./bitburner.hacknet.md ) > [getCoreUpgradeCost ](./bitburner.hacknet.getcoreupgradecost.md )
## Hacknet.getCoreUpgradeCost() method
Calculate the cost of upgrading hacknet node cores.
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**Signature:**
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```typescript
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getCoreUpgradeCost(index: number, n?: number): number;
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```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| index | number | Index/Identifier of Hacknet Node. |
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| n | number | _(Optional)_ Number of times to upgrade cores. Must be positive. Will be rounded to the nearest integer. Defaults to 1 if not specified. |
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**Returns:**
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number
Cost of upgrading the specified Hacknet Node's number of cores.
## Remarks
RAM cost: 0 GB
Returns the cost of upgrading the number of cores of the specified Hacknet Node by n.
If an invalid value for n is provided, then this function returns 0. If the specified Hacknet Node is already at max level, then Infinity is returned.
