#include <iostream>

using namespace std;


int main()
{
    int g, m, a; // declare 3 ints for day, month, year
    cout << "Immetti la data: ";
    cin >> g >> m >> a; // take g, m, a from stdin

    // must be divisible by 4 and, if divisible by 100, it must also be divisible by 400
    bool isLeapYr = a % 4 == 0 && (a % 100 != 0 || (a % 100 == 0 && a % 400 == 0));

    bool isValidYear = a > 0; // leap year algorithm does not work for years BC

    bool isValidMonth = m > 0 && m < 13;

    /*
        Thirty days hath September
        April, June and November;
        February has twenty eight alone
        All the rest have thirty-one
        Except in Leap Year, that's the time
        When February's Days are twenty-nine
    */
    bool isValidDay = (g > 0 && (g < 29 || (g < 32 && m != 2 && m != 11 && m != 4 && m != 6 && m != 9) || (g < 31 && m != 2) || (g < 30 && isLeapYr)));

    if (isValidYear && isValidMonth && isValidDay) cout << "Data corretta" << endl;
    else cout << "Data non valida" << endl;

    return 0;
}