user: Question: What is the total number of Issues has a End month of oct-80?
Columns: ['Start month', 'End month', 'Cover', 'Spine', 'Indicia', 'Masthead', 'Number of issues']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: ['Summer-52', 'Feb-55', 'Fantastic', 'Fantastic', 'Fantastic', 'Fantastic', 16.0]
SQL:

assistant: SELECT SUM("Number of issues") FROM "Table" WHERE "End month" = 'oct-80';