#include <bits/stdc++.h>
#include "souvenirs.h"
using namespace std;
#define double long double
#define ull unsigned long long
#define BIG __int128
#define fi first
#define se second
#define MASK(i) (1ll << i)
#define BIT(x, i) (((x) >> (i)) & 1)
#define sz(x) (int)(x).size()
#define debug cout << "NO ERROR", exit(0);
#define TASK "txt"
#define IOS ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
const int MOD = 1e9 + 7;
const long long INF = 1000000000000000000ll;
const int LimN = 100 + 5;
void maximize(int &x, int y){
x = max(x, y);
}
void minimize(int &x, int y){
x = min(x, y);
}
void add(int &x, int y){
x = (x % MOD + y % MOD) % MOD;
}
long long cnt[LimN], p[LimN];
void buy_souvenirs(int n, long long P0){
auto [v, r] = transaction(P0 - 1);
P0 = P0 - 1 - r;
if (sz(v) == 1){
transaction(P0 - 1);
transaction(P0 - 1);
} else transaction(P0 / 2);
}
