#include <iostream>
#include <vector>
#include <utility>
using namespace std;
std::pair<std::vector<int>, long long> transaction(long long M);
void solve_2(int N, long long P0) {
transaction(P0 - 1);
}
void solve_3(int N, long long P0) {
auto t = transaction(P0 - 1);
long long s = P0 - 1 - t.second;
if (t.first.size() == 1) {
transaction(s - 1);
transaction(s - 1);
} else {
transaction(s / 2);
}
}
void buy_souvenirs(int N, long long P0) {
if (N == 2) {
solve_2(N, P0);
return;
}
if (N == 3) {
solve_3(N, P0);
return;
}
}
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