#include <stdio.h>

void main()
{
	int c,n,i,t,count,a[10010];
	scanf("%d",&c);
	while (c--)
	{
		count=0;
		scanf("%d",&n);
		for (i=1;i<=n;i++)
			scanf("%d",&a[i]);
		for (i=1;i<=n;i++)
		{
			if (a[i]!=i)
			{
				t=a[a[i]];
				a[a[i]]=a[i];
				a[i]=t;
				count++;
			}
		}
		printf("%d\n",count);
	}
}