program ABC115A
    implicit none
    integer(8)::D
    read(5,*)D

    if(D==25)then
        print'(A)',"Christmas"
    else if(D==24)then
        print'(A)',"Christmas Eve"
    else if(D==23)then
        print'(A)',"Christmas Eve Eve"
    else if(D==22)then
        print'(A)',"Christmas Eve Eve Eve"
    end if
end program ABC115A