#include "souvenirs.h"
#include <utility>
#include <vector>
#include <bits/stdc++.h>
using namespace std;
void buy_souvenirs(int N, long long P0) {
  	
  	//int ans=P0-1-a;
  	//res=transaction(ans);
  	if(N==3){
  	    pair<vector<int>, long long> res = transaction(P0-1);
  	    long long a=res.second;
  	    vector<int> b=res.first;
  	 //   for(auto ab:b){
  	 //       cout<<ab<<" ";
  	 //   }
  	 //   cout<<endl;
  	 //   cout<<a<<endl;
  	    if(b.size()==2 && a==0){
  	        transaction((P0-1)/2);
  	    }
  	    else if(b.size()==2 && a>0){
  	        transaction((P0-1-a)/2);
  	    }
  	    else{
      	    transaction(P0-2-a);
      	    transaction(P0-2-a);
  	        
  	    }
  	    return;
  	}
  	else{
    	for(int i=1; i<N; i++){
    	    for(int j=1; j<=i; j++){
    	        transaction(P0-1);
    	    }
    	    P0--;
    	}
    	return;
  	}
  	//return;
}
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