百练 3756 多边形内角和

题目链接：http://bailian.openjudge.cn/practice/3756

# include <stdio.h>int main(){int n,i;int sum,a[1000];while(scanf("%d",&n)!=EOF){if(n==0)break;sum=(n-2)*180;for(i=0;i<n-1;i++){scanf("%d",&a[i]);sum-=a[i];}printf("%d\n",sum);}return 0;}