What would be a better way to write this formula to get a checkbox checked:

ISPICKVAL( Country_of_Citizenship__c , "Austria") || 
ISPICKVAL( Country_of_Citizenship__c , "Belgium") || 
ISPICKVAL( Country_of_Citizenship__c , "Czech Republic") || 
ISPICKVAL( Country_of_Citizenship__c , "Denmark") || 
ISPICKVAL( Country_of_Citizenship__c , "Estonia") || 
ISPICKVAL( Country_of_Citizenship__c , "Finland") || 
ISPICKVAL( Country_of_Citizenship__c , "France") || 
ISPICKVAL( Country_of_Citizenship__c , "Germany") || 
ISPICKVAL( Country_of_Citizenship__c , "Greece") || 
ISPICKVAL( Country_of_Citizenship__c , "Hungary") || 
ISPICKVAL( Country_of_Citizenship__c , "Iceland") || 
ISPICKVAL( Country_of_Citizenship__c , "Italy") || 
ISPICKVAL( Country_of_Citizenship__c , "Latvia") || 
ISPICKVAL( Country_of_Citizenship__c , "Liechtenstein") || 
ISPICKVAL( Country_of_Citizenship__c , "Netherlands") || 
ISPICKVAL( Country_of_Citizenship__c , "Norway") || 
ISPICKVAL( Country_of_Citizenship__c , "Poland") || 
ISPICKVAL( Country_of_Citizenship__c , "Portugal") || 
ISPICKVAL( Country_of_Citizenship__c , "Slovakia") || 
ISPICKVAL( Country_of_Citizenship__c , "Slovenia") || 
ISPICKVAL( Country_of_Citizenship__c , "Spain") || 
ISPICKVAL( Country_of_Citizenship__c , "Sweden") || 
ISPICKVAL( Country_of_Citizenship__c , "Switzerland")