#include <iostream>
#include <cstdlib>
using namespace std;

bool is_leap(int year);

int main()
{
	int month, day, year;	//uninitialized variables
	cout << "Enter month (1 to 12), day (1 to 31), year (1 up).\n"
		<< "Press RETURN after each number.\n";

	if (!(cin >> month >> day >> year)) {
		cerr << "input failed\n";
		return EXIT_FAILURE;
	}

	//Distance from January 1, 1 AD to the date the user input.
	//For example, if the user input January 1, 1 AD,
	//then distance would be zero.
	int distance = day - 1;

	for (int y = 1; y < year; ++y) {
		distance += 365;	//means distance = distance + 365;

		if (is_leap(y)) {
			++distance;
		}

		if (y == 1752) {
			distance -= 11;	//Missing September 3 to 13 inclusive.
		}
	}

	const int length[] = {
		0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
	};

	for (int m = 1; m < month; ++m) {
		if (m == 2 && is_leap(year)) {
			distance += 29;
		} else {
			distance += length[m];
		}
	}

	const string name[] = {
		"Satur",	//January 1, 1 AD was a Saturday.
		"Sun",
		"Mon",
		"Tues",
		"Wednes",
		"Thurs",
		"Fri"
	};

	cout << name[distance % 7] << "day "
		<< month << "/" << day << "/" << year << "\n";

	return EXIT_SUCCESS;
}

bool is_leap(int year)
{
	if (year <= 1752) {
		return year % 4 == 0;	//Julian calendar before Gregorian
	}

	if (year % 400 == 0) {
		return true;		//1600 and 2000 were leap years.
	}

	if (year % 100 == 0) {
		return false;		//1700 and 1800 were not leap years.
	}

	return year % 4 == 0;
}