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