Finding Frame Number (Paging Techniques)

#include <iostream>
#include<vector>
using namespace std;
int main() {
    vector<int>arr;
  int n,s;
  while(cin>>n)
  {
   arr.push_back(n);
  }
  s=arr.size();
  cout<<"0"<<" "<<arr[s-1];
 
    return 0;
}