Does this case need extra fans?

So I recently got all the components for my new pc, but I'm questioning if it needs more fans or not...

PCPartPicker part list](https://pcpartpicker.com/list/Zr4LxY) / [Price breakdown by merchant](https://pcpartpicker.com/list/Zr4LxY/by_merchant/)

Type|Item|Price
:----|:----|:----
**CPU** | [AMD - Ryzen 7 1700X 3.4GHz 8-Core Processor](https://pcpartpicker.com/product/9Q98TW/amd-ryzen-7-1700x-34ghz-8-core-processor-yd170xbcaewof) | $335.64 @ Jet
**CPU Cooler** | [CRYORIG - R1 Universal 76.0 CFM CPU Cooler](https://pcpartpicker.com/product/8TvRsY/cryorig-cpu-cooler-crr1b) | $99.49 @ OutletPC
**Motherboard** | [ASRock - X370 KILLER SLI/ac ATX AM4 Motherboard](https://pcpartpicker.com/product/LgmxFT/asrock-x370-killer-sliac-atx-am4-motherboard-x370-killer-sliac) | $126.98 @ Newegg
**Memory** | [G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-2400 Memory](https://pcpartpicker.com/product/9bhj4D/gskill-memory-f42400c15d16gvs) | $113.88 @ OutletPC
**Storage** | [Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive](https://pcpartpicker.com/product/MwW9TW/western-digital-internal-hard-drive-wd10ezex) | $48.33 @ OutletPC
**Video Card** | [Sapphire - Radeon RX 580 8GB NITRO+ Video Card](https://pcpartpicker.com/product/sF648d/sapphire-radeon-rx-580-8gb-nitro-video-card-11265-01) | $259.99 @ SuperBiiz
**Case** | [NZXT - Phantom (White) ATX Full Tower Case](https://pcpartpicker.com/product/RXrG3C/nzxt-case-phan001wt) | $116.99 @ SuperBiiz
**Power Supply** | [EVGA - SuperNOVA G2 850W 80+ Gold Certified Fully-Modular ATX Power Supply](https://pcpartpicker.com/product/LCfp99/evga-power-supply-220g20850xr) | $116.89 @ OutletPC
**Optical Drive** | [Samsung - SH-118CB/BEBE DVD/CD Drive](https://pcpartpicker.com/product/gPx9TW/samsung-optical-drive-sh118cbbebe) | $19.88 @ OutletPC
**Operating System** | [Microsoft - Windows 10 Home OEM 64-bit](https://pcpartpicker.com/product/wtgPxr/microsoft-os-kw900140) | $87.89 @ OutletPC
**Monitor** | [Asus - PB258Q 25.0" 2560x1440 60Hz Monitor](https://pcpartpicker.com/product/KBbkcf/asus-monitor-pb258q) | $301.00 @ Amazon
| *Prices include shipping, taxes, rebates, and discounts* |
| Total (before mail-in rebates) | $1666.96
| Mail-in rebates | -$40.00
| **Total** | **$1626.96**
| Generated by [PCPartPicker](http://pcpartpicker.com) 2017-05-18 13:05 EDT-0400 |


This is my first go at building my own pc, so idk a whole lot about it. I've read posts that said the fans are fine as they are, and I shouldn't need more, but ive read others that say no. I would just buy them to be safe, but I went way over my budget on this pc, so I'm kind of cutting myself off as far as spending.

So, does this case need extra fans for my build? Could I get away with just the stock fans?