#include <iostream>
#include <stdexcept>


using namespace std;

class Date {
private:
    int day, month, year, days_from_begining;
public:
    Date(int d, int m, int y) {
        if (y < 1970 || y > 2099) {
            throw "std::invalid_argument";
        } else if (m > 12 || m < 1) {
            throw "std::invalid_argument";
        } else if ((((m % 2 == 1 && m <= 7) || ((m % 2 == 0) && (m >= 8))) && 1 <= d && d <= 31)
                   || (((m == 4) || (m == 6) || (m == 9)) && (1 <= d) && (d <= 30)) ||
                   (((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) && 1 <= d && d <= 29)
                   || (!((y % 4 == 0 && y % 100 != 0) || y % 400 == 0) && 1 <= d && d <= 28)) {
            day = d;
            month = m;
            year = y;
        } else {
            throw "std::invalid_argument";
        }

        //Считаем, сколько дней прошло от начала
        int k = 0;
        for (int i = 1; i != month; ++i) {
            if (i == 1 || i == 3 || i == 5 || i == 7 || i == 8 || i == 10 || i == 12) {
                k += 31;
            } else if (i == 4 || i == 6 || i == 9) {
                k += 30;
            } else if ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0)) {
                k += 29;
            } else {
                k += 28;
            }
        }
        k += day;
        int leap_years = 0;
        leap_years = (year - 1972) / 4 + 1;
        k += (year - 1970)*356 + leap_years;
        days_from_begining = k;
    }

    int GetDay() const {
        return day;
    }

    int GetMonth() const {
        return month;
    }

    int GetYear() const {
        return year;
    }

    bool operator++() {
        if (day == 31 && month == 12) {
            day = 1;
            month = 1;
            ++year;
        } else if ((month % 2 == 1 && month <= 7 || month % 2 == 0 && month >= 8) && day == 31) {
            day = 1;
            ++month;
        } else if ((month == 4 || month == 6 || month == 9) && day == 30) {
            day = 1;
            ++month;
        } else if ((year % 4 == 0 && year % 100 != 0) && day == 29) {
            day = 1;
            ++month;
        } else if (!(year % 4 == 0 && year % 100 != 0) && day == 28) {
            day = 1;
            ++month;
        } else {
            ++day;
        }
    }

    bool operator--() {
        if (day == 1 && month == 1) {
            day = 31;
            month = 12;
            --year;
        } else if ((month % 2 == 1 && month <= 7 || month % 2 == 0 && month >= 8) && day == 1) {
            day = 30;
            --month;
        } else if ((month == 4 || month == 6 || month == 9) && day == 1) {
            day = 31;
            --month;
        } else if ((year % 4 == 0 && year % 100 != 0) && day == 29) {
            day = 1;
            ++month;
        } else if (!(year % 4 == 0 && year % 100 != 0) && day == 28) {
            day = 1;
            ++month;
        } else if (month == 3 && day == 1) {
            if (year % 4 == 0 && year % 100 != 0) {
                --month;
                day = 29;
            } else {
                --month;
                day = 28;
            }
        } else {
            --day;
        }
    }

    Date operator+(Date &date2) const {

    }

};

int main() {

}