#include <iostream>

using namespace std;

int main() {

	// Read in integers until we see a negative value,
	// output the sum
	int num;
	int sum;

	cout << "Please enter integers, negative value when done: ";
	
	// Initialization
	sum = 0;
	cin >> num;   // get first value

	while ( num >= 0 ) {
		sum = sum + num;   // update sum
		cin >> num;		   // get next value
	}
	cout << "Sum was: " << sum << endl;

	return 0;
}