Density of air is about 1.23 kg/m^3 at standard pressure/temperature at sea level.

Density of helium is about 0.16 kg/m^3.

That’s a delta of 1.07 kg/m^3. So for a 70kg man, they would need helium balloons equal to 65.4 m^3, or 65400 liters. Spread across 200 condoms, that’s 327 L per condom.

I’m not sure where my numbers come up differently from yours, but that’s still not feasible.