#include<iostream>
#include<cstdlib>
#include<math.h>

using namespace std;
   int main(){
      int radius;
      int pi = 3.1416;
      cout << "ASSALAMUALIKUM Wellcome to my programming world...NAYEM"<<endl;
      cout << "Please enter your radius...";
      cin >> radius;
      cout << "area :" << pi*radius*radius<<endl;
      cout << "parameter :" << 2*pi*radius;
      cout <<endl<< "Congratulation by";
      }
