<Li> Human resource weakness (based on indicators of nutrition, health, education and adult literacy) and </Li> <Li> Economic vulnerability (based on instability of agricultural production, instability of exports of goods and services, economic importance of non-traditional activities, merchandise export concentration, handicap of economic smallness, and the percentage of population displaced by natural disasters) </Li> <P> LDC criteria are reviewed every three years by the Committee for Development Policy (CDP) of the UN Economic and Social Council (ECOSOC). Countries may "graduate" out of the LDC classification when indicators exceed these criteria . The United Nations Office of the High Representative for the Least Developed Countries, Landlocked Developing Countries and Small Island Developing States (UN-OHRLLS) coordinates UN support and provides advocacy services for Least Developed Countries . The classification (as of June 2017) applies to 47 countries . </P> <P> Since the LDC category was initiated, only four countries have graduated to developing country status . The first country to graduate from LDC status was Botswana in 1994 . The second country was Cape Verde in 2007 . Maldives graduated to developing country status on 1 January 2011, while Samoa graduated in 2014 . It is anticipated that Equatorial Guinea and Vanuatu will be the next countries to be promoted from LDC status, followed by Angola . At the UN's fourth conference on LDCs, which was held in May 2011, delegates endorsed a goal targeting the promotion of at least half the current LDC countries within the next ten years . </P>

If country a is an agricultural country and country b has many cities