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;
}