day_of_programmer

/*
From 1700 to 1917, Russia's official calendar was the Julian calendar; since  they used the Gregorian calendar
system. The transition from the Julian to Gregorian calendar system occurred in 1918,when the next day after January
31st was February 14th. This means that in 1918, February 14th was the 32nd day of the year in Russia.
*/

#include <iostream>
#include <cstring>
#include <bits/stdc++.h>


using namespace std;

int main(){
    int y;
    cin >> y;
    
    if(y>=1919){
        if(y%400==0 || (y%4==0 and y%100 !=0)){
            cout<<"12.09."<<to_string(y);
        }
        
        else{
            cout<<"13.09."<<to_string(y);
        }
    }
   
    else if(y<=1917){
        if(y%4==0){
            cout<<"12.09."<<to_string(y);
        }
        
        else{
            cout<<"13.09."<<to_string(y);
        }
    }
    
    if(y==1918){
        cout<<"26.09.1918";
    }
    return 0;
}