#include <iostream>
#include <random>
#include <vector>
using namespace std;
int main() { 
    vector<int> numbers = {23, 25, 21, 6, 15, 4}; 
    random_device rd; 
    mt19937 gen(rd());
    uniform_int_distribution<> dis(0, numbers.size() - 1);
    int random_index = dis(gen);
    cout<<numbers[random_index];
    return 0;
}