#include<stdio.h>
int main()
{
	int a[1024],i,ok=1,N;
	freopen("culori.in","r",stdin);
	scanf("%d",&N);
	for(i=1;i<=2*N-1;i++)
	{
		scanf("%d",&a[i]);
		if(a[i]==a[i-1])
			ok=0;
	}
	freopen("culori.out","w",stdout);
	printf("%d\n",ok);
	return 0;
}