#include <iostream>
#include <vector>

int main()
{
    std::vector<int> nums { 1, 2, 3, 4, 5 };

    int sum = 0;

    // Internally, this uses begin and end,
    // but it abstracts it away.
    for (const auto& i : nums) {
        sum += i;
    }

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