赛时代码：

//t1 nest rp+=INF
#include<bits/stdc++.h>
using namespace std;

const int N=1e5+10;
int n,a[N],b[N],c[N],f[N];
long long ans;

int main()
{
//	freopen("nest.in","r",stdin);
//	freopen("nest.out","w",stdout);
	scanf("%d",&n);
	for(int i=1;i<=n;++i)
	{
		scanf("%d",&a[i]);
		f[a[i]]++;
	}
	for(int i=1;i<=n;++i)
	{
		scanf("%d",&b[i]);
	}
	for(int i=1;i<=n;++i)
	{
		scanf("%d",&c[i]);
		ans+=f[b[c[i]]];
	}
	printf("%lld",ans);
//	fclose(stdin);
//	fclose(stdout);
	return 0;
}