import std.stdio, std.algorithm, std.conv, std.array, std.string, std.math, std.typecons, std.numeric;

void main()
{
    auto D = readln.chomp.to!int;
    switch (D) {
        case 22:
            writeln("Christmas Eve Eve Eve");
            break;
        case 23:
            writeln("Christmas Eve Eve");
            break;
        case 24:
            writeln("Christmas Eve");
            break;
        case 25:
            writeln("Christmas");
            break;
        default:
    }
}