d = int(eval(input()))



if d == 25:

    print("Christmas")

elif d == 24:

    print("Christmas Eve")

elif d == 23:

    print("Christmas Eve Eve")

elif d == 22:

    print("Christmas Eve Eve Eve")

    
d = int(eval(input()))



print(("Christmas"+" Eve"*(25-d)))
d = int(eval(input()))
if d == 25:
    print("Christmas")
elif d == 24:
    print("Christmas Eve")
elif d == 23:
    print("Christmas Eve Eve")
elif d == 22:
    print("Christmas Eve Eve Eve")

d = int(eval(input()))
print(("Christmas" + " Eve" * (25 - d)))

-if d == 25: -    print("Christmas") -elif d == 24: -    print("Christmas Eve") -elif d == 23: -    print("Christmas Eve Eve") -elif d == 22: -    print("Christmas Eve Eve Eve") +print(("Christmas" + " Eve" * (25 - d)))