int main()
{
	int n,a[1003],max=0,min=11;
	double sum=0;
	scanf("%d",&n);
	for(int i = 0;i<=n;++i)
	{
		scanf("%d",&a[i]);
		if(a[i]>max)
		{
			max=a[i];
		}
		if(a[i]<min)
		{
			min=a[i];
		}
		sum+=a[i];
	}
	printf("%.2f",sum);
	return 0;
}