#include <stdio.h>
#include <math.h>
int main()
{
	int num, sum = 0;
	scanf_s("%d", &num);
	while (num != -999)
	{
		sum += num;
		scanf_s("%d", &num);
	}
	printf("Sum = %d\n", sum);
	system("pause");
	return 0;
}