#include "souvenirs.h"
#include <utility>
#include <vector>
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mod = 1000000007;
int p[200005];
void buy_souvenirs(int n, long long p0) {
    ll ask = p0 - 1;
    pair<vector<int>, ll> res = transaction(ask);
    if(res.first.size() == 1){
        ask -= res.second + 1;
        transaction(ask);
        transaction(ask);
    }
    else{
        ll sum = ask - res.second;
        transaction(sum / 2);
    }
    return;
}
// int main(){
// cin.tie(0)->sync_with_stdio(0);
    
// }
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