How many years passed between the annexation of the Novgorod Republic and the "eternal" peace treaty?
return Novgorod Republic ;return the  annexation of #1 ;return eternal peace treaty ;return when  was  #2 ;return when  was  #3 ;return the  difference of #5 and  #4
['select', 'project', 'select', 'project', 'project', 'arithmetic']