一篇非常奇怪的代码

#include<bits/stdc++.h>
#define _ int
#define _____ 114514
#define ______ main
#define _______ scanf
#define ________ printf
#define __________ for
#define ______________ if
#define _______________ return
#define __________________ max
#define ___________________ using namespace std
___________________;
_ __,___,____,____________[_____],_____________,________________,_________________;
_ ______(){
	_______("%d",&__);
	__________(_ ___________;___________<=__;___________++){
		_______("%d",&____________[___________]);
	}
	_______("%d%d",&___,&____);
	__________(_ ___________;___________<=__;___________++){
		_____________+=____________[___________];
	}
	______________(_____________<__*___||_____________>__*____){
		________("-1");
		_______________ 0;
	} 
	__________(_ ___________;___________<=__;___________++){
		______________(____________[___________]<1){
			________________+=___-____________[___________];
		}
		______________(____________[___________]>____){
			_________________+=____________[___________]-____;
		}
	}
	________("%d",__________________(________________,_________________));
	_______________ 0;
}