N = int(eval(input()))

if N == 25 :

    print("Christmas")

elif N == 24 :

    print("Christmas Eve")

elif N == 23 :

    print("Christmas Eve Eve")

elif N == 22 :

    print("Christmas Eve Eve Eve")

N = int(eval(input()))

plus = " Eve"

ans = "Christmas" + plus*(25-N)

print(ans)

N = int(eval(input()))
if N == 25:
    print("Christmas")
elif N == 24:
    print("Christmas Eve")
elif N == 23:
    print("Christmas Eve Eve")
elif N == 22:
    print("Christmas Eve Eve Eve")

N = int(eval(input()))
plus = " Eve"
ans = "Christmas" + plus * (25 - N)
print(ans)

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