#include <iostream>
#include <numeric> 

int main() {
    int ages[5] = {21, 19, 35, 42, 28};

    std::cout << "Initial Array Values" << std::endl;

    std::cout << "The first person's age is: " << ages[0] << std::endl;
    std::cout << "The last person's age is: " << ages[4] << std::endl;

    ages[1] = 20;
    std::cout << "\nArray after modification" << std::endl;
    std::cout << "The second person's age is updated to: " << ages[1] << std::endl;

    int sum_of_ages = 0;
    std::cout << "\nIterating through all ages" << std::endl;

    for (int age : ages) {
        std::cout << "Age: " << age << std::endl;
        sum_of_ages += age;
    }

    std::cout << "The total sum of all ages is: " << sum_of_ages << std::endl;
    std::cout << "The average age is: " << static_cast<double>(sum_of_ages) / 5 << std::endl;

    return 0;
}