////  1002 Grading.cpp//  Jobdu////  Created by PengFei_Zheng on 2017/4/14.//  Copyright © 2017年 PengFei_Zheng. All rights reserved.// #include <stdio.h>#include <iostream>#include <algorithm>#include <string.h>#include <cmath> using namespace std; double p,t,g1,g2,g3,gj; double score(){    if(abs(g1-g2)<=t) return (g1+g2)/2;    int abs1 = abs(g3-g1);    int abs2 = abs(g3-g2);    bool flag1 = abs1<=t ? true : false;    bool flag2 = abs2<=t ? true : false;    if(flag1 && !flag2) return (g3+g1)/2;    if(flag2 && !flag1) return (g3+g2)/2;    if(flag1 && flag2 ) return max(max(g1,g2),g3);    else return gj;} int main(){    while(scanf("%lf%lf%lf%lf%lf%lf",&p,&t,&g1,&g2,&g3,&gj)!=EOF){        printf("%.1lf\n",score());    }}/**************************************************************    Problem: 1002    User: zpfbuaa    Language: C++    Result: Accepted    Time:0 ms    Memory:1520 kb****************************************************************/