#include <vector>
#include <numeric>
#include <iostream>
#include <execution>

int sum(std::vector<int> const& values)
{
    return std::reduce(std::execution::par_unseq, 
                       values.begin(), values.end());
}

int main()
{
    std::vector<int> v(1000000, 1);
    int answer { sum(v) };
    std::cout << answer << std::endl;
}