#include <iostream>
#include <math.h>
int main(void) {
std::string days[7] = { "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" };
int year_number = 2020;
int month_number = 1;
int day_number = 22;
if( month_number < 3 ){
month_number += 12;
year_number -= 1;
}
int century_number = year_number / 100;
year_number = year_number % 100;
int day = day_number + floor( (month_number + 1) * 13.0 / 5.0 ) +
year_number + floor( year_number / 4.0 ) +
floor( century_number / 4.0 ) -
2 * century_number;
day = day % 7;
std::cout << "The weekday you were born on is " << days[day] << std::endl;
return 0;
}
