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+name = 'people_in_capitals/1'
+slug = 'number of people living in capitals'
+
+description = '''\
+<p><code>people_in_capitals(N)</code>: <code>N</code> is the total number of people living in capital cities of the world.</p>
+<p>Useful predicates:</p>
+<li><code>country(Name, ID, Capital, CapitalProvince, Size, Population)</code></li>
+<li><code>city(Name, Country ID, Province, Population, Lat, Lon, Elevation)</code>.</li>
+'''
+
+hint = {}