#include<stdio.h>
int main()
{
int n,i,sum,t;
while(scanf("%d",&n)!=EOF&&n!=0)
{
sum=0;
for(i=0;i<n;i++)
{
scanf("%d",&t);
sum=sum+t;
}
printf("%d\n",sum);
}
return 0;
}
#include<stdio.h>
int main()
{
int n,i,sum,t;
while(scanf("%d",&n)!=EOF&&n!=0)
{
sum=0;
for(i=0;i<n;i++)
{
scanf("%d",&t);
sum=sum+t;
}
printf("%d\n",sum);
}
return 0;
}