#include <stack>
#include <iostream>

class my_stack : public std::stack< int > {
public:
    using std::stack<int>::c; // expose the container
};

int main() {
my_stack blah;
blah.push( 1 );
blah.push( 2 );
int sum = 0;
for(int i=0;i<blah.size();i++){
	sum+=blah.c[i];
}

std::cout<<sum<<std::endl;


}