#include "souvenirs.h"
#include <bits/stdc++.h>
using namespace std;
using out = std::pair<std::vector<int>, long long>;
void buy_souvenirs(int N, long long P0) {
    out res = transaction(P0 - 1);
    if(N == 3) {
        // n = 3
        
        if(res.first.size() == 2) { // rebuy
            transaction((P0 - 1 - res.second) / 2);
        } else {
            auto P1 = P0 - 1 - res.second;
            transaction(P1 - 1);
            transaction(P1 - 1);
        }
    }
    return;
}
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