#include "souvenirs.h"
#include <utility>
#include <vector>
using namespace std;
void buy_souvenirs(int N, long long P0) {
  long long x = P0 - 1;
  pair<vector<int>, long long> t = transaction(x);
  vector<int> v = t.first;
  long long sum = x - t.second;
  for (int i = 0; i < v.size(); i++) {
    if (v[i] == 2) {
      transaction(sum/2);
      return;
    }
  }
  transaction(sum - 1);
  return;
}
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