#include <iostream>
#include <vector>
#include <string>
#include <ctime>

class Date {
public:
Date(const Date& d) = default;
explicit Date(int year, int month, int day) :
y(year), m(month), d(day) {
}

bool IsLeap() const {
if (this->y % 100 == 0) {
return this->y % 400 == 0;
} else {
return this->y % 4 == 0;
}
}

std::string ToString() const {
return std::to_string(this->d + 100).erase(0, 1) + '.' +
std::to_string(this->m + 100).erase(0, 1) + '.' +
std::to_string(this->y + 10000).erase(0, 1);
}

Date DaysLater(int days) const {
int new_d = this->d;
int new_m = (this->m + 9) % 12;
int new_y = this->y - new_m / 10;;
int64_t days_count = 365 * new_y + new_y / 4 - new_y / 100 + new_y / 400 +
(new_m * 306 + 5) / 10 + (new_d - 1);
days_count += days;
new_y = (10000 * days_count + 14780) / 3652425;
int ddd = days_count - (365 * new_y + new_y / 4 - new_y / 100 + new_y / 400);
if (ddd < 0) {
new_y = new_y - 1;
ddd = days_count - (365 * new_y + new_y / 4 - new_y / 100 + new_y / 400);
}
int mi = (100 * ddd + 52) / 3060;
int mm = (mi + 2) % 12 + 1;
new_y = new_y + (mi + 2) / 12;
int dd = ddd - (mi * 306 + 5) / 10 + 1;
Date new_date(new_y, mm, dd);
return new_date;
}

int DaysLeft(const Date& date) const {
int d1 = this->d;
int m1 = (this->m + 9) % 12;
int y1 = this->y - m1 / 10;;
int64_t days_count1 = 365 * y1 + y1 / 4 - y1 / 100 + y1 / 400 +
(m1 * 306 + 5) / 10 + (d1 - 1);

int d2 = date.d;
int m2 = (date.m + 9) % 12;
int y2 = date.y - m2 / 10;;
int64_t days_count2 = 365 * y2 + y2 / 4 - y2 / 100 + y2 / 400 +
(m2 * 306 + 5) / 10 + (d2 - 1);
return days_count2 - days_count1;
}

private:
int y;
int m;
int d;
};