#include<bits/stdc++.h>
//#include "souvenirs.h"
using namespace std;
typedef long long ll;
//#define int ll
#define endl '\n'
#define pb push_back
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
const int MOD=1000000007;
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (a*(b/gcd(a,b)))
#define fios(); ios_base::sync_with_stdio(0);cin.tie(0);
#define fraction(x); cout.unsetf(ios::floatfield); cout.precision(x); cout.setf(ios::fixed,ios::floatfield);
#define file(); freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);
pair<vector<int>,ll> transaction(ll m);
void buy_souvenirs(int n, ll p0){
int cur=p0;
int next=0;
for(int i=1;i<n;i++){
for(int j=1;j<=i;j++){
auto p=transaction((cur+1)/2);
next=((cur+1)/2)-p.ss;
}
cur=next;
}
return ;
}
