int main(){
	int sz[100][100], n, i, j, a, b, c, d;
	scanf("%d", &n);
	for(i=0;i<n;i++){
		for(j=0;j<n;j++){
			scanf("%d",&sz[i][j]);
	}}
	for(i=1;i<n-1;i++){
		for(j=1;j<n-1;j++){
			if(sz[i-1][j]==0&&sz[i][j-1]==0&&sz[i-1][j-1]==0){
				a=i;
				b=j;}
			if(sz[i][j+1]==0&&sz[i+1][j]==0&&sz[i+1][j+1]==0){
				c=i;
				d=j;}
			
	}}
	printf("%d", (c-a+1)*(d-b+1));
	return 0;

}