1. year = int(input("Enter the year: "))
2. month = int(input("Enter the month: "))
3. day = int(input("Enter the day: "))
4. # need to raise valueerror if year < 1
5.  
6. def anchor(year) :
7.     rem = (year//100)%4
8.     if rem == 0:
9.         return 2
10.     elif rem == 1:
11.         return 0
12.     elif rem == 2:
13.         return 5
14.     elif rem == 3:
15.         return 3
16.  
17. def calc_leap(year) :
18.     if year / 4 != year // 4 :
19.         return 0
20.     elif year / 100 != year // 100 :
21.         return 1
22.     elif year / 400 != year // 400 :
23.         return 0
24.     else :
25.         return 1
26.  
27. leap = calc_leap(year)
28.  
29. def calc_doomsday(year) :
30.     yy = year - 100 * (year // 100)
31.     return (anchor(year) + yy // 12 + yy % 12 + (yy % 12) // 4) % 7
32.  
33. doom = calc_doomsday(year)
34.  
35. def calc_weekday(year, month, day) :
36.     # calculate forward/backward from nearest doomsday
37.     if month == 1:
38.         return (day - 3 - leap + doom) % 7
39.     elif month == 2:
40.         return (day - 28 - leap + doom) % 7
41.     elif month == 3:
42.         return (day - 0 + doom) % 7
43.     elif month == 4:
44.         return (day - 4 + doom) % 7
45.     elif month == 5:
46.         return (day - 9 + doom) % 7
47.     elif month == 6:
48.         return (day - 6 + doom) % 7
49.     elif month == 7:
50.         return (day - 11 + doom) % 7
51.     elif month == 8:
52.         return (day - 8 + doom) % 7
53.     elif month == 9:
54.         return (day - 5 + doom) % 7
55.     elif month == 10:
56.         return (day - 10 + doom) % 7
57.     elif month == 11:
58.         return (day - 7 + doom) % 7
59.     elif month == 12:
60.         return (day - 12 + doom) % 7
61.  
62. def print_weekday(x) :
63.     if x == 0:
64.         print("Sunday")
65.     elif x == 1:
66.         print("Monday")
67.     elif x == 2:
68.         print("Tuesday")
69.     elif x == 3:
70.         print("Wednesday")
71.     elif x == 4:
72.         print("Thursday")
73.     elif x == 5:
74.         print("Friday")
75.     elif x == 6:
76.         print("Saturday")
77.  
78. print_weekday(calc_weekday(year, month, day))