#include <iostream>
#include <set>
 
using std::set;
using std::cout;
using std::endl;
 
int main() {
 
  int A[6] = { 3, 5, 7, 3, 3, 5 };
 
  int countPS = 0;
 
  for ( int i = 1; i <= 6; i++ ) {
 
    set<int> P;
    P.insert( A , A + i );
 
    for ( int j = 5; j >= 0; j-- ) {
 
       set<int> S;
       S.insert( A + j, A + 6 );
 
       if ( P == S )
          countPS++;
    } 
  }
  cout << "The number of elements in list (P,S) = " << countPS << endl;
 
  return 0;
}

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