why is the answer 17 in the following code

Question

#include <iostream>
using namespace std;

int main()
{
int x = 5;
int *p = &x;

x = x + 4;
x = *p + 4;
*p = *p + 4;

cout << x << endl
<< x << endl
<< *p << endl;

return 0;
}

please help me!

Answer 1

p = &x means *p = x

So, the core of the code is:
x = x + 4
x = x + 4
x = x + 4
meaning
x = 5 + 4 = 9
x = 9 + 4 = 13
x = 13 + 4 = 17

That's why the output is 17 17 17.

Answer 2

thank you for your answer!