#include<bits/stdc++.h>
#define int long long
using namespace std;
int z;
map<string,int> all;
string t[10005],w[10005];
map<string,int> q;
string c[20005];
signed main(){
	int n,sum=0;
	cin>>n;
	for(int i=1;i<=n;i++){
		string a,b;
		cin>>t[i]>>a>>b>>w[i];
		if(q[t[i]]==0){
			z++;
			c[z]=t[i];
		}
		q[t[i]]=1;
		if(q[w[i]]==0){
			z++;
			c[z]=w[i];
		}
		q[w[i]]=1;
		
		if(all[t[i]+" "+w[i]]!=0)all[t[i]+" "+w[i]]++,n--,i--;
		else all[t[i]+" "+w[i]]=1;
	}
	for(int i=1;i<=z;i++){
		for(int j=1;j<=z;j++){
			if(all[c[i]+" "+c[j]]==0)continue;
			for(int k=1;k<=n;k++){
				if(all[c[k]+" "+c[i]]==0)continue;
				if(all[c[j]+" "+c[k]]==0)continue;
				for(int l=1;l<=n;l++){
					if(all[c[l]+" "+c[k]]==0)continue;
					if(all[c[i]+" "+c[l]]==0)continue;
					if(all[c[j]+" "+c[l]]==0)continue;
					sum+=all[c[i]+" "+c[j]]*all[c[k]+" "+c[i]]*all[c[j]+" "+c[k]]*all[c[l]+" "+c[k]]*all[c[i]+" "+c[l]]*all[c[j]+" "+c[l]];
				}
			}
		}
	}
	cout<<sum;
	return 0;
}