#include<stdio.h> main() { int i,n,a[1000],sum; while(1) { scanf("%d",&n); if(n!=0) { sum=0; for(i=0;i<n;i++) scanf("%d",&a[i]); for(i=0;i<n;i++) sum+=a[i]; printf("%d\n",sum); } else break; } }
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