#include <iostream>

using namespace std;

int main()
{
    int day, month, year;

    cout << "Please enter your birth date (day, month, year): ";
    cin >> day >> month >> year;

    int day_today = 15, month_today = 10, year_today = 2020;

    bool birthday_this_year = false;

    // first we have to find out if the user already had a birthday this year:
    if(month < month_today)
        birthday_this_year = true;
    else if(month == month_today)
        if(day <= day_today)
            birthday_this_year = true;

    int age = year_today - year;

    if(birthday_this_year)
        cout << "You are " << age << " years old.\n";
    else
    {
        --age;      // decrease the value of age by 1
        cout << "You are " << age << " years old.\n";
    }
    return 0;
}