#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>

class Date {
 private:
  int day, month, year;
  std::stringstream str;
  constexpr static const int
      leap[12] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  constexpr static const int
      not_leap[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  struct date {
    int year, month, day;
  };
  int number_by_date() {
    int year = this->year - 1;
    int kinda_answer = 365 * year + year / 4 - year / 100 + year / 400;
    for (int i = 0; i < month - 1; i++) {
      if (IsLeap()) {
        kinda_answer += leap[i];
      } else {
        kinda_answer += not_leap[i];
      }
    }
    kinda_answer += day;
    return kinda_answer;
  }
  static date date_by_number(int number) {
    int min_year = 1, max_year = 4000;
    while (max_year != min_year) {
      int mid = (min_year + max_year) / 2;
      if (number - (365 * mid + mid / 4 - mid / 100 + mid / 400) < 0) {
        max_year = mid;
      } else {
        min_year = mid + 1;
      }
    }
    int year = min_year - 1;
    number -= 365 * year + year / 4 - year / 100 + year / 400;
    year++;
    bool is_leap = year % 400 == 0 || year % 4 == 0 && year % 100 != 0;
    int month = 1;
    for (int i = 0; i < 12; i++) {
      if (is_leap) {
        if (number > leap[i]) {
          number -= leap[i];
          month++;
        } else {
          break;
        }
      } else {
        if (number > not_leap[i]) {
          number -= not_leap[i];
          month++;
        } else {
          break;
        }
      }
    }
    if (month == 13) {
      year += 1;
      month = 1;
    }
    int day = number;
    return date{year, month, day};
  }

 public:
  Date(int year, int month, int day) {
    this->year = year;
    this->month = month;
    this->day = day;
  }

  bool IsLeap() {
    if (year % 400 == 0 || year % 4 == 0 && year % 100 != 0) {
      return true;
    }
    return false;
  }

  std::string ToString() {
    str << std::setw(2) << std::setfill('0') << day
        << std::setw(0) << "."
        << std::setw(2) << month << std::setw(0) << "."
        << std::setw(4) << year;
    std::string answer;
    str >> answer;
    return answer;
  }

  Date DaysLater(int days) {
    auto smth = date_by_number(number_by_date() + days);
    return {smth.year, smth.month, smth.day};
  }

  int DaysLeft(Date date) {
    return date.number_by_date() - number_by_date();
  }
};