#include<iostream>
using namespace std;
int N;
int A[2<<17],B[2<<17];
main()
{
	cin>>N;
	for(int i=0;i<=2*N;i++)cin>>A[i];
	bool ok=true;
	for(int i=0;i<2*N;i++)
	{
		B[i]=(A[i+1]-A[i]+3)%3;
		if(B[i]==0)ok=false;
	}
	for(int i=0;i<2*N;i+=2)if(B[i]!=B[i+1]||i>0&&B[i]==B[i-1])ok=false;
	if(ok)
	{
		cout<<(B[0]==1^N%2==1?2:1)<<endl;
	}
	else cout<<0<<endl;
}