#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_last_year = true;

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

    int age = year_today - year;

    if(birthday_last_year)
        --age;
    cout << "You are " << age << " years old.\n";

    if(age >= 18)
        cout << "You are an adult." << endl;
    else
        cout << "You are not an adult.\n";      // '\n' == endl
    return 0;
}