Why are you multiplying yearly salaries with months? :)
JetBrains devs likely cost around 100k/y year here in CEE by the way. But I think 3M is a reasonable guess, 30 FTE years (7 devs, 1 PM, 1 UX, 1 "overhead" (other management costs)).
50k per month (600k per year) is an extraordinarily high salary even in the US. I assume the parent poster meant 50k per month for the team of 5, so each dev is getting 10k per month/120k per year.
But let's say 5 people working 12 months x 50,000 USD = 250,000 USD.
Even considering non US payrolls at 50k per year, that's a significant expense.