How many case fans should I have

[Taky]

In my build should I have one more case fan to put at the back of the case so I have 2 at the top, one at the back and then a front mounted radiator? or should I have a completely different setup. I'm going to also be overclocking my cpu to about 4.7 or 4.7GHz

 

PCPartPicker part list: https://ca.pcpartpicker.com/list/V62zBP
Price breakdown by merchant: https://ca.pcpartpicker.com/list/V62zBP/by_merchant/

CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor  (Purchased For $334.99) 
CPU Cooler: Corsair - H100i v2 70.7 CFM Liquid CPU Cooler  (Purchased For $109.99) 
Motherboard: ASRock - Fatal1ty Z370 Gaming K6 ATX LGA1151 Motherboard  (Purchased For $199.99) 
Memory: G.Skill - Ripjaws V Series 16GB (2 x 8GB) DDR4-3200 Memory  (Purchased For $199.99) 
Storage: Western Digital - Black PCIe 256GB M.2-2280 Solid State Drive  (Purchased For $129.99) 
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  (Purchased For $54.99) 
Video Card: EVGA - GeForce GTX 1070 8GB SC GAMING ACX 3.0 Black Edition Video Card  (Purchased For $515.00) 
Case: Fractal Design - Meshify C ATX Mid Tower Case  (Purchased For $99.99) 
Power Supply: EVGA - SuperNOVA G2 650W 80+ Gold Certified Fully-Modular ATX Power Supply  (Purchased For $109.99) 
Total: $1754.92
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-11-25 22:37 EST-0500