text: #include <iostream>
  #include <iomanip>
  using namespace std;
  
  int main()
  {
  	double amount = 22.0 / 7;
  	cout << amount << endl;
  	for (int i = 1; i <= 4; i++) {
  		cout << setprecision(i) << amount << endl;
  	}
  	cout << setprecision(ios::scientific) << amount << endl;
  	return 0;
  }
  