#include <stdio.h>

#define DEBUG 1
#define SENTINEL -1

int main() {
  int score, sum=0;
  printf("Enter first score (%d to quit)> ", SENTINEL);
  scanf("%d", &score);      /* get first score */
  while (score != SENTINEL) {
    sum += score;
    if (DEBUG) printf("score=%d, sum=%d\n", score, sum);
    printf("Enter next score (%d to quit)> ", SENTINEL);
    scanf("%d", &score);   /* get next score */
  }
  printf("Total score is %d\n", sum);
  return 0;
}