D = int(eval(input()))

print(("Christmas"+" Eve"*(25-D)))
import sys

input = sys.stdin.buffer.readline



D = int(eval(input()))



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

import sys

input = sys.stdin.buffer.readline
D = int(eval(input()))
print(("Christmas" + " Eve" * (25 - D)))

+import sys + +input = sys.stdin.buffer.readline