#include <bits/stdc++.h>
#include "souvenirs.h"
using namespace std;
using ll = long long;
void buy_souvenirs(int N, long long P0) {
  if (N == 2) {
    pair<vector<int>, ll> p = transaction(P0 - 1);
  } else {
    auto[v, s] = transaction(P0 - 1);
    if ((int)v.size() == 1) {
      transaction(P0 - s - 2);
    } else {
      transaction((P0 - s - 1) / 2);
    }
  }
}
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