What will be the output of the following C++ code?

#include <iostream>
#include <string>
using namespace std;
class A
{
	static int a;
    public:
	void change(int i){
		a = i;
	}
	void value_of_a(){
		cout<<a;
	}
};
 
int A::a = 5;
 
int main(int argc, char const *argv[])
{
	A a1 = A();
	A a2 = A();
	A a3 = A();
	a1.change(10);
	a1.value_of_a();
	a2.value_of_a();
	a3.value_of_a();
	return 0;
}