scanf("%d%d",&cows,&rates);
	for (i=0; i<=rates-1; i++)
	{
		scanf("%d%d",&cow1,&cow2);
		matrix[cow1][++compress[cow1]] = cow2;
	}
	
	for (n=1; n<=cows; n++)
	{
		memset(isVisit, 0, (N+1)*sizeof(bool));
		dfs(n);
	}