#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define f1 first
#define s2 second
#define pb push_back
#define mp make_pair
#define ll long long
#define fri(a) freopen(a,"r",stdin);
#define fro(a) freopen(a,"w",stdout);
const int N=405;
int n,ans;
string s;
vector<string>str;
map<string,int>cnt;
int main(){
//fri("in.txt");
//fro("out.txt");
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin>>n;
for(int i=0;i<n;i++){
cin>>s;
str.pb(s);
}
for(int i=0;i<n;i++){
if(cnt[str[i]]!=0){
ans+=cnt[str[i]];
continue;
}
for(int j=0;j<n;j++){
if(j!=i && str[j].length()>=str[i].length() && str[j].find(str[i])!=string::npos){
ans++;
cnt[str[i]]++;
}
}
}
cout<<ans<<endl;
return 0;
}
