九度oj题目1002：Grading

//不是说C语言就是C++的子集么，为毛printf在九度OJ上不能通过编译，abs还不支持参数为整型的abs()重载

//C++比较正确的做法是#include<cmath.h>，cout的格式输出需要用到#include<iomanip>库函数，具体为：cout<<fixed<<setprecision(1)<<score<<endl;结果保留一位小数

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
int maxscore(int ,int ,int);
int main()
{
	double p,t,g1,g2,g3,gj;
	while(cin>>p>>t>>g1>>g2>>g3>>gj)
	{
		double score;
		if(g1<=p&&g2<=p&&t<p)
		{
			if(abs(g1-g2)<=t)
			{
				score=(g1+g2)/2.0;
			}else if(abs(g1-g3)<=t&&abs(g3-g2)<=t)
			{
				score=maxscore(g1,g2,g3);
			}else if(abs(g1-g3)<=t||abs(g3-g2)<=t)
			{
				if(abs(g1-g3)<abs(g2-g3))
				{
					score=(g1+g3)/2.0;
				}else
				{
					score=(g2+g3)/2.0;
				}
			}
			else
			{
				score=gj;
			}
		}
 
		cout<<fixed<<setprecision(1)<<score<<endl;
	}
 
	return 0;
}
int maxscore(int g1,int g2 ,int g3)
{
	double score;
	if(g1>g2)
	{
		if(g1>g3)
			score=g1;
		else
			score=g3;
	}else
	{
		if(g2>g3)
			score=g2;
		else
			score=g3;
	}
	return score;
}