#include <iostream>
#include <string>
#include <array>
#include <memory>

std::string exec(std::string & cmd) {
    std::array<char, 128> buffer;
    std::string result;
    std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd.c_str(), "r"), pclose);
    if (!pipe) {
        throw std::runtime_error("popen() failed!");
    }
    while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
        result += buffer.data();
    }
    return result;
}

int main (int argc, char ** argv) {
    if (std::atoi(argv[1]) == 0)
        return std::cout << 0, 0;
    std::string c = std::string() + argv[0] + " " + std::to_string(std::atoi(argv[1]) - 1);
    std::cout << 1 + std::stoi(exec(c));
}