#include<stdio.h>
int main(){
int cnt;
int x,sum;
printf("输入个数");
scanf("%d",&cnt);
if (cnt>0) {
int number[cnt];
cnt=0;
scanf("%d",&x);
while (x!=-1){
number[cnt]=x;
sum +=x;
cnt ++;
scanf("%d",&x);
}
}
printf("%d",sum);
return 0;
}