#coding:utf-8
x =  int(input())
ans = 'Christmas'
for i in range(25-x):
    ans+=' Eve'
print (ans)

3cc5d71c7d674d6433242cf124285bc8cc324e7b
<mask token>

<mask token>
for i in range(25 - x):
    ans += ' Eve'
print(ans)

x = int(input())
ans = 'Christmas'
for i in range(25 - x):
    ans += ' Eve'
print(ans)

#coding:utf-8
x =  int(input())
ans = 'Christmas'
for i in range(25-x):
    ans+=' Eve'
print (ans)
