sumadiv

#include <iostream>

using namespace std;

int main()
{

  unsigned n,nr=0,x=1;
  cout<<"n=";cin>>n;

 while (nr!=n) {
    if ((2*x+1)%n==0)
 {
     cout<<x<<" "<<x+1<<endl;
     nr++;
 }

  x++;}

return 0;}