#include <iostream>

using namespace std;

​

int add(int myNumber) {

  static int total = 0;

  total += myNumber;

  return total;

}

​

int main() {

  cout << add(5) << "\n";

  cout << add(2) << "\n";

  cout << add(4) << "\n";

  cout << add(9) << "\n";

  return 0;

}

​