The gamete counter

You will count the cells made by meiosis in the testis and in the ovary, and find the number of chromosomes in each cell of the two processes.

The idea. One primary spermatocyte makes four sperms. One primary oocyte makes one ovum and up to three polar bodies. A cell that has finished meiosis I or meiosis II is haploid, with $23$ chromosomes.

Your tasks.

1. Finish sperms_from. It gives the number of sperms from n primary spermatocytes.
2. Finish ova_and_polar_bodies. It gives a pair: the ova, and the largest number of polar bodies, from n primary oocytes.
3. Finish chromosomes. It gives $23$ for a stage in haploid and $46$ for any other stage.