#include "souvenirs.h"
#include <utility>
#include <vector>
//pragma GCC optimize("Ohio")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define matrix vector<vector<ll>>
#define fi first
#define se second
#define BIG __int128
#define wtf array<int,3>
#define dcm pair<int,int>
#define db long double
//MAIN
void buy_souvenirs(int N, ll P0){
if (N == 2){
transaction(P0 - 1);
return ;
}
for (int i = 1; i <= N - 3; i++){
P0--;
auto [v, c] = transaction(P0);
P0 -= c;
for (int j = 2; j <= i; j++) transaction(P0);
}
bool check = false;
P0--;
auto [v, c] = transaction(P0);
if (v.size() == 1) P0 -= c;
else check = true;
for (int j = 2; j <= N - 2; j++) transaction(P0);
for (int j = 2 + check; j <= N - 1; j++) transaction(P0 - 1);
}
