#include <iostream>
#include <algorithm>
using namespace std;
 
int main() {
	int a[4];
	int b[4];
	for(int i=0;i<=3;i++){
		cin>>a[i];
		a[i]=a[i]%3;
	}for(int j=0;j<=3;j++){
		cin>>b[j];
 
	}int n=sizeof(b)/sizeof(b[0]);
	sort(b,b+n);
 
 
 
	for(int k=0;k<=3-1;k++){int sum=0;
		for(int l=0;l<=4-1;l++){
		a[l]=(a[l]+k)%3;
 
	}
	int p=sizeof(a)/sizeof(a[0]);
	sort(a,a+p);for(int x=0;x<=4-1;x++){
		if(a[x]==b[x]){sum++;
 
		}else 
		sum=sum;
	}if(sum==4){
		cout<<k;
		break;
	}
 
	}
	return 0;
}

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MCAwIDIgMQoyIDAgMSAxCgoK

0 0 2 1
2 0 1 1