#include <array>
#include <numeric>
#include <iostream>
int main()
{
    std::array<int, 5> a = {1, 3, 5, 7, 9};
    int tage = 0;

    auto it = a.begin();
    int sum = std::accumulate(it, it+3, tage);

    std::cout << sum << '\n';
}