class pruefsumme{
	
	public static int pruef(char[] test1, char[] test2)
	{
		int erg=0;
		
		char[] temp = new char[test1.length+test2.length];
		
		for(int i=0;i<test1.length;i++)
		{	temp[i] = test1[i];		}	//System.out.println(temp[i]);
			
		for(int i=test1.length;i<(test1.length+test2.length);i++)
		{	temp[i]=test2[i-4];		}	//System.out.println("i: " + i + " temp[i]" + temp[i]);
		
		for(int i=0;i<temp.length;i++)
		{
			
			if(i==0 || i==3 || i==6 || i==9 || i==12 || i==15 || i==18)
				erg += ((temp[i]-'0')*7);		//System.out.println("If1");
					
			
			else if(i==1 || i == 4 || i==7 || i==10 || i==13 || i==16)
				erg += ((temp[i]-'0')*3);		//System.out.println("If2");		
			
			else if(i==2 || i == 5 || i ==8 || i==11 || i==14 || i==17)
				erg += ((temp[i]-'0')*1);		//System.out.println("If3");
						
			else
				System.out.println("Else");	
		}										//System.out.println("For-Schleife");
		
		
		//Die Zahl am Ende rausfiltern
		
		erg = erg%10;							
		return erg;


		
	}
	
	public static int pruef(char[] test1, char[] test2, char[] test3)
	{
		int erg=0;
		int laenge1 = test1.length;
		int laenge2 = laenge1 + test2.length;
		int laenge3 = laenge2 + test3.length;
		
		System.out.println("Länge1: "+laenge1);
		System.out.println("Länge2: "+laenge2);
		System.out.println("Länge3: "+laenge3);
		
		char[] temp = new char[laenge3];
		
		for(int i=0;i<laenge1;i++)
		{	temp[i] = test1[i];	
			//System.out.println("i: " + i + " temp[i]" + temp[i]);		
		}	
			
		for(int i=laenge1;i<laenge2;i++)
		{	temp[i]=test2[i-laenge1];
			//System.out.println("i: " + i + " temp[i]" + temp[i]);		
		}	
		
		for(int i=laenge2;i<laenge3;i++)
		{	temp[i]=test3[i-laenge2];	
			//System.out.println("i: " + i + " temp[i]" + temp[i]);	
		}	
		
		for(int i=0;i<laenge3;i++)
		{
			
			if(i==0 || i==3 || i==6 || i==9 || i==12 || i==15 || i==18)
				erg += ((temp[i]-'0')*7);		//System.out.println("If1");
					
			
			else if(i==1 || i == 4 || i==7 || i==10 || i==13 || i==16)
				erg += ((temp[i]-'0')*3);		//System.out.println("If2");		
			
			else if(i==2 || i == 5 || i ==8 || i==11 || i==14 || i==17)
				erg += ((temp[i]-'0')*1);		//System.out.println("If3");
						
			else
				System.out.println("Else");	
		}										//System.out.println("For-Schleife");
		
		
		//Die Zahl am Ende rausfiltern
		
		erg = erg%10;							
		return erg;


		
	}
}