let ch v = if v = "25" then "Christmas" else v;;
let ch2 v = if v = "24" then "Christmas Eve" else v;;
let ch3 v = if v = "23" then "Christmas Eve Eve" else v;;
let ch4 v = if v = "22" then "Christmas Eve Eve Eve" else v;;



print_string " "; print_string (ch4(ch3(ch2(ch(read_line ()))))); print_string "\n";;