|Hand|1 credit|2 credits|3 credits|4 credits|5 credits|
|---|---|---|---|---|---|
|Royal flush|250|500|750|1000|4000*|
|Straight flush|60|120|180|240|400|
|Four aces|400|800|1200|1600|2000|
|Four of a kind, 2-4|100|200|300|400|500|
|Four of a kind, 5-K|50|100|150|200|250|
|Full house|8|16|24|32|40|
|Flush|5|10|15|20|25|
|Straight|4|8|12|16|20|
|Three of a kind|3|6|9|12|15|
|Two pair|1|2|3|4|5|
|Jacks or better|1|2|3|4|5|
|Theoretical return|98.68%|98.68%|98.68%|98.68%|99.92%*|

Question: the number of flush wins at one credit to equal one flush win at 5 credits.
Answer: 5