Guess birth date program

guess_date.cpp

#include <iostream>
#include <vector>
using namespace std;

void display(vector<vector<int>> &card)
{
	for(int i = 0; i < card.size(); i++)
	{
		for(int j = 0; j < card[0].size(); j++)
		{
			cout << card[i][j] << " ";
		}
		cout << "\n";
	}
	cout << endl;
}

int main()
{
	// initializing cards
	vector<vector<int>> card1 = {{1, 3, 5, 7},
								 {9, 11, 13, 15}, 
								 {17, 19, 21, 23}, 
								 {25, 27, 29, 31}};
	vector<vector<int>> card2 = {{2, 3, 6, 7}, 
								 {10, 11, 14, 15}, 
								 {18, 19, 22, 23}, 
								 {26, 27, 30, 31}};
	vector<vector<int>> card3 = {{4, 5, 6, 7}, 
								 {12, 13, 14, 15}, 
								 {20, 21, 22, 23}, 
								 {28, 29, 30, 31}};
	vector<vector<int>> card4 = {{8, 9, 10, 11}, 
								 {12, 13, 14, 15}, 
								 {24, 25, 26, 27}, 
								 {28, 29, 30, 31}};
	vector<vector<int>> card5 = {{16, 17, 18, 19}, 
								 {20, 21, 22, 23}, 
								 {24, 25, 26, 27}, 
								 {28, 29, 30, 31}};

    int sum = 0;
    int ip;
	display(card1);
	cout<< "Type 1 if you could see your birth date in this matrix \n";
	cin >> ip;
	if(ip == 1)
		sum += card1[0][0];

	display(card2);
	cout<< "Type 1 if you could see your birth date in this matrix \n";
	cin >> ip;
	if(ip == 1)
		sum += card2[0][0];

	display(card3);
	cout<< "Type 1 if you could see your birth date in this matrix \n";
	cin >> ip;
	if(ip == 1)
		sum += card3[0][0];

	display(card4);
	cout<< "Type 1 if you could see your birth date in this matrix \n";
	cin >> ip;
	if(ip == 1)
		sum += card4[0][0];

	display(card5);
	cout<< "Type 1 if you could see your birth date in this matrix \n";
	cin >> ip;
	if(ip == 1)
		sum += card5[0][0];

	cout << "Youd birth date is: " << sum;
	return 0;
}