How many atoms are present in one cc of helium gas at STP?

Explanation

At STP , 22400 cc= `6.022xx10^(23)` atoms
At STP, one cc =?
Number of molecules present in one cc `=(6.022xx10^(23))/(2.24xx10^(4))`
One cc of helium gas at STP contains `2.69xx10^(19)` atoms