#/***********************************************************
#    dayweek.rb -- ÍËÆü
#***********************************************************/

name = [ 
    "Sunday", "Monday", "Tuesday", "Wednesday",
    "Thursday", "Friday", "Saturday"]

printf("Year ? ");  year = gets.to_i
printf("Month? ");  month = gets.to_i
printf("Day  ? ");  day = gets.to_i
if (month < 3);  year -= 1;  month += 12;  end
dayofweek = (year + year / 4 - year / 100 + year / 400\
    + (13 * month + 8) / 5 + day) % 7
printf("It's %s.\n", name[dayofweek])

exit 0