#include <iostream>
#include <math.h>

int add (int a, int b) {
    return a + b;
}


int multiple (int a, int b) {
    return a * b;
}

int substraction (int a, int b) {
    return a - b;
}

int devide (int a, int b) {
    return round(a / b);
}

int main () {
    std::cout << "ADD: " << add(4, 5) << "\n";
    std::cout << "ADD: " << substraction(13, 9) << "\n";
    std::cout << "ADD: " << multiple(4,2) << "\n";
    std::cout << "ADD: " << devide(4,2) << "\n";
    

    return 0;
}