How many years before the start of the War did Petro Doroshenko Hetmansign the treaty with Sultan Mehmed IV?
return Petro Doroshenko Hetman sign the  treaty with Sultan Mehmed IV ;return the  start of the   War ;return year of #1 ;return year of #2 ;return the  difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']