//////////////////////////////////////////////////////////////
//　　　階　乗　単　体　計　算 0.0.3
//////////////////////////////////////////////////////////////

function Factorial(String){
var String_Kai = eval(String);
var String_Factorial="1";
now= new Date;
var time=now.getTime();
for(now_Factorial=1;now_Factorial<=String_Kai;now_Factorial++){
	var Factorial_A=String_Factorial;
	var Factorial_B=now_Factorial+"";
	String_Factorial=Factorial_Multiplication( Factorial_A , Factorial_B );
	status=Factorial_B;
	}
now2= new Date;
time=(now2.getTime()-time)/1000;

var Factorial_C = String_Factorial+","+time;
return Factorial_C;
}

function Factorial_Multiplication(String_A_PointOut,String_B_PointOut){
	
	
	//6桁区切りの計算の最大数
	var limitA = Math.ceil(String_A_PointOut.length/6);
	var limitB = Math.ceil(String_B_PointOut.length/6);
	var AB = "0";
	
	for(A_Loop=0 ; A_Loop<limitA ; A_Loop++){
		var A_Zero="";
		var Multiplication_A = String_A_PointOut.substr(A_Loop*6,6);
		
		for(Loop_A_Zero=0 ; Loop_A_Zero<(String_A_PointOut.length-A_Loop*6-6) ; Loop_A_Zero++){
		A_Zero+="0";
		}
		//左側の0を除去
		z=1;
		while(z==1){
		if(Multiplication_A.charAt(0)=="0"){Multiplication_A=Multiplication_A.substr(1,Multiplication_A.length-1);}else{break;}
		}
		if(Multiplication_A==""){Multiplication_A="0";}
		
		for(B_Loop=0 ; B_Loop<limitB ; B_Loop++){
			var B_Zero="";
			var Multiplication_B = String_B_PointOut.substr(B_Loop*6,6);
			
			for(Loop_B_Zero=0 ; Loop_B_Zero<(String_B_PointOut.length-B_Loop*6-6) ; Loop_B_Zero++){
			B_Zero+="0";
			}
			//左側の0を除去
			z=1;
			while(z==1){
				if(Multiplication_B.charAt(0)=="0"){Multiplication_B=Multiplication_B.substr(1,Multiplication_B.length-1);}else{break;}
			}
			if(Multiplication_B==""){Multiplication_B="0";}
			
			var AB_2 = String(eval(Multiplication_A)*eval(Multiplication_B))+A_Zero+B_Zero;
			if(AB_2!="0"){AB=Factorial_Addition(AB,AB_2);}else{AB=AB;}
		}
	}
	
	
	//左側の0を除去
	z=1;
	while(z==1){
		if(AB.charAt(0)=="0"){AB=AB.substr(1,AB.length-1);}else{break;}
	}
	if(AB==""){AB="0";}
	
	var String_C=AB;
	
	return String_C;
}




function Factorial_Addition(String_A_PointOut,String_B_PointOut){
	
	
	
	
			var String_A_2=String_A_PointOut;
			var String_B_2=String_B_PointOut;
		if(String_A_2.length > String_B_2.length){var String_A_3=String_A_2;var String_B_3=String_B_2;}
		if(String_A_2.length < String_B_2.length){var String_A_3=String_B_2;var String_B_3=String_A_2;}
		if(String_A_2.length==String_B_2.length){var String_A_3="0"+String_A_2;var String_B_3=String_B_2;}
	
	var Up_String=0;
	var String_C_3="";
	var String_C_2="";
	var String_C="";
	
	

	//加算
		for(Mode_Plus=1 ; Mode_Plus<=String_A_3.length ; Mode_Plus++){
			if(Mode_Plus>String_B_3.length){
				Addition_B=0;
			}else{
				Addition_B=eval(String_B_3.charAt(String_B_3.length-Mode_Plus));
			}
			
			var A_B=Up_String+eval(String_A_3.charAt(String_A_3.length-Mode_Plus))+Addition_B;
			
			if(String(A_B).length==2){
				Up_String=1;
				String_C_3+=String(eval(A_B)-10);
			}else{
				Up_String=0;
				String_C_3+=String(A_B);
			}
		}
	String_C_3+=Up_String;
	
	//数列を逆にする
	for(String_C_3_SUB=1;String_C_3_SUB<=String_C_3.length;String_C_3_SUB++){
		String_C_2+=String_C_3.charAt(String_C_3.length-String_C_3_SUB);
	}
	//左側の0を除去
	z=1;
	while(z==1){
		if(String_C_2.charAt(0)=="0"){String_C_2=String_C_2.substr(1,String_C_2.length-1);}else{break;}
	}
	if(String_C_2==""){String_C_2="0";}
	String_C+=String_C_2;
	
	return String_C;
}