United Nations System
There are 15 members of the Security Council, consisting of five veto-wielding permanent members (China, France, Russia, the United Kingdom, and the United States) and 10 elected non-permanent members with two-year terms. This basic structure is set out in Chapter V of the UN Charter. Security Council members must always be present at UN headquarters in New York so that the Security Council can meet at any time.
Poland and the United Nations
In addition, Poland sat on the United Nations Security Council as a non-permanent member five times (1946-1947, 1960, 1970-1971, 1982-1983, 1996-1997) and its currently serving its sixth term from 2018-2019.