#include <stdio.h>
#define FIN "culori.in"
#define FOUT "culori.out"
#define MAX 1000

long N, i, A[MAX];
long val;

int main() {
	freopen(FIN, "r", stdin);freopen(FOUT, "w", stdout);
	scanf("%ld", &N);
	N = 2*N-1;
	for (i=0; i<N; ++i)
		scanf("%ld", A+i);
	
	val = 1;
	for (i=0; i<N; ) {
		long tmp=0;
		for (; A[i]==A[i+2] && A[i+1] == A[i+3]; i+=2, tmp++);
		if ( tmp )
			val*=(tmp*2), val %= 9901;
		i+=2;
	}

	printf("%ld\n", val);
	fclose(stdin); fclose(stdout);
	return 0;
}