#include <iostream>

int main() {
    //declarar variables
    int l=8;
    //proceso
    int area=l*l;
    int perimetro=l+l+l+l;
    std::cout << "area es " << area << std::endl;
    std::cout << "perimetro es " << perimetro << std::endl;
    std::cout << "Hello world!" << std::endl;
    return 0;
}