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

class className {
    private:
    static int a;
    
    public:
    Student() {
        a++;
    }
};

int className :: a = 0;

int main() {
    className obj1;
    className obj2;
    className obj2;
    
    cout << className :: a;
    return 0;
}