How much is social security 4858?

This kind of subsidy, this age division, is a local policy, especially the 4858 unemployment benefit you mentioned, which is not stipulated and expressed in the Social Labor and Social Security Law. You'd better consult the local social security department. No one understands local policies except the general policy of social security.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.