puts "For what year would you like to know the date of Easter? (2015-2025)"
year = gets.chomp
case year
when "2015" then puts "April 5"
when "2016" then puts "March 27"
when "2017" then puts "April 16"
when "2018" then puts "April 1"
when "2019" then puts "April 21"
when "2020" then puts "April 12"
when "2021" then puts "April 4"
when "2022" then puts "April 17"
when "2023" then puts "April 9"
when "2024" then puts "March 31"
when "2025" then puts "April 20"
else puts "Invalid year"
end