In Jain cosmology, the count of Tirthankars depends on the kshetra and on the time-cycle.

A commonly taught count is:

• Bharat kshetra: 24
• Airavat kshetra: 24
• Each Mahavideh kshetra: 20

So, if you mean the commonly counted 15 karma-bhumi kshetras:

• 2 Bharat kshetras → 24 + 24 = 48
• 2 Airavat kshetras → 24 + 24 = 48
• 8 Mahavideh kshetras → 8 × 20 = 160

Total = 256 Tirthankars.

In simple form:

• Bharat + Airavat + Mahavideh = 256 Tirthankars in that standard count.

If you want, I can also give the Jain cosmology-wise full kshetra breakdown in a very short table.