> #include "iostream"
> using namespace std;
> 
> int main(void)
> {
> 	int i;
> 	float a,sum;
> 	while (1)
> 	{
> 		sum = 0;
> 		for (i=0;i<12;i++)
> 		{
> 			cin>>a;
> 			sum+=a;
> 		}
> 		sum = sum/12;
> 		printf("$%.2f\n",sum);
> 	}
> 	return 0;
> }

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