D= int(eval(input()));



C = "Christmas";

E = " Eve";



if D==25:

    print(C);

elif 21 < D < 25:

    print((C+(E*(25-D))));

D = int(eval(input()))



chris = 'Christmas'

eve = ' Eve'

num = 25



if D in range(22,25):

    num -= D

    eve = ' Eve' * num

    chris += eve



print(chris)

D = int(eval(input()))
C = "Christmas"
E = " Eve"
if D == 25:
    print(C)
elif 21 < D < 25:
    print((C + (E * (25 - D))))

D = int(eval(input()))
chris = "Christmas"
eve = " Eve"
num = 25
if D in range(22, 25):
    num -= D
    eve = " Eve" * num
    chris += eve
print(chris)

-C = "Christmas" -E = " Eve" -if D == 25: -    print(C) -elif 21 < D < 25: -    print((C + (E * (25 - D)))) +chris = "Christmas" +eve = " Eve" +num = 25 +if D in range(22, 25): +    num -= D +    eve = " Eve" * num +    chris += eve +print(chris)