1048.cpp

zju 1048 Financial Managementhttp://acm.zju.edu.cn/show_problem.php?pid=1048

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
	int i=0;
	float t,s=0;
	while (cin>>t)
	{
		i++;
		s=s+t;
	}
	cout<<"$"<<fixed<<setprecision(2)<<s/i<<endl;
}