#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 > 2) {
        // n = 3
        transaction((P0 - 1 - res.second) / 2);
    }
    return;
}
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