#include<bits/stdc++.h>
using namespace std;
pair<vector<int>,long long> transaction(long long M);
int cnt=0;
pair<vector<int>,long long>c[105];
long long k[105];
long long p1[105];
int let[105];
void remove(vector<int>v) {
for(int i:v) {
let[i]--;
}
}
void buy_souvenirs(int N,long long p0) {
for(int i=0;i<N;i++) {
let[i]=i;
}
long long last=p0-1;
while(true) {
auto [v,r]=transaction(last);
remove(v);
c[v[0]]={v,r};
k[v[0]]=last;
long long sum=last-r;
if(v.size()==1&&v.back()==N-1) {
p1[N-1]=sum;
break;
}
if(v.size()==1) {
last=sum-1;
}
else {
last=sum/long(v.size());
}
}
for(int i=N-2;i>=2;i--) {
vector<int>v;
long long r;
long long next;
if(c[i].first.empty()) {
pair<vector<int>,long long>e=transaction(2*p1[i+1]);
v=e.first,r=e.second;
remove(v);
next=2*p1[i+1];
}
else {
pair<vector<int>,long long>e=c[i];
v=e.first,r=e.second;
next=k[i];
}
p1[i]=next-r;
for(int j=1;j<v.size();j++) {
p1[i]-=p1[v[j]];
}
}
for(int i=2;i<N;i++) {
for(int j=0;j<let[i];j++) {
transaction(p1[i]);
}
}
}
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