#include <iostream>

int main() {

    int sum = 0;

    int num;

    std::cout << "Enter positive numbers (enter a negative number to stop): " << std::endl;

    std::cin >> num;

    while (num >= 0) {

        sum += num;

        std::cin >> num;

    }

    std::cout << "The sum of the positive numbers is: " << sum << std::endl;

    return 0;

}