1185. Day of the Week

class Solution:
    def dayOfTheWeek(self, d: int, m: int, y: int) -> str:
        if m < 3:
            m += 12
            y -= 1
        c = y // 100
        y = y % 100
        w = (c // 4 - 2 * c + y + y // 4 + 13 * (m + 1) // 5 + d - 1) % 7
        return [
            "Sunday",
            "Monday",
            "Tuesday",
            "Wednesday",
            "Thursday",
            "Friday",
            "Saturday",
        ][w]