#include <iostream>
#include <vector>

// The fixed input has at least one element and its first value is small.
void change_copy(std::vector<int> copy) {
    copy[0] += 10;
    std::cout << copy[0] << '\n';
}

int main() {
    std::vector<int> original{3, 1, 4};
    std::vector<int> copy{original};
    copy[0] += 10;
    std::cout << original[0] << ' ' << copy[0] << ' '
              << original.size() << ' ' << copy.size() << '\n';
    change_copy(original);
    std::cout << original[0] << '\n';
    return 0;
}