#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#warning Check Integer OverFlow
#define ll long long
#define rep(i,a,b) for(int i=a;i<b;i++)
#define maxs(a,b) if(b>a)a=b
#define mins(a,b) if(b<a)a=b
#define debug(x) cerr<<"["<<#x<<":"<<x<<"] "
#define debug2(a,b) debug(a);debug(b)
#define debug3(a,b,c) debug2(a,b);debug(c)
#define de cerr
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (((a)/(__gcd(a,b))) * b)
#define print(arr) for(auto it = arr.begin();it < arr.end();it ++){cout << *it << " ";}cout << ln;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define all(a) (a).begin(), (a).end()
#define vi vector<int>
#define v vector
#define p pair
#define pii p<int,int>
#define pb push_back
#define mk make_pair
#define f first
#define s second
#define ln "\n"
typedef long double ld;
using namespace std;
using namespace __gnu_pbds;
ll modF=1e9+7;
/*OUTPUT
*/
int N;
string a[20000];
bool cmp(string ax,string bx){
return ax.length() > bx.length();
}
bool sub(int i,int j){
int l1 = a[i].length();
int l2 = a[j].length();
// for(int it = 0;it <= l1 - l2;it ++){
// bool pos = true;
// for(int k = it;k < it + l2;k ++){
// if(a[i][k] != a[j][k - it])
// pos = false;
// }
// if(pos){
// return true;
// }
// }
// return false;
int pi[l2];
pi[0] = 0;
for(int it = 1;it < l2;it ++){
int h = pi[it - 1];
while(h > 0 and a[j][h] != a[j][it]){
h = pi[h - 1];
}
if(a[j][it] == a[j][h]){
h ++;
}
pi[it] = h;
}
// debug2(a[i],a[j])
// for(auto e:pi){
// debug(e);
// }
// de << ln;
int it1 = 0;
int it2 = 0;
while(it1 < l1){
while(it2 < l2 and it1 < l1 and a[i][it1] == a[j][it2]){
it1 ++;
it2 ++;
}
if(it2 == 0){
it1 ++;
continue;
}
if(it2 == l2){
return true;
}
it2 = pi[it2 - 1];
}
return false;
}
void solve(){
cin >> N;
rep(i,0,N){
cin >> a[i];
}
sort(a,a + N,cmp);
int ans = 0;
for(int i = 0;i < N;i ++){
for(int j = i + 1;j < N;j ++){
if(a[i] == a[j]){
ans += 2;
}
else if(sub(i,j)){
ans ++;
}
}
}
cout << ans << ln;
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);
int t = 1;
// cin >> t;
while(t --){
solve();
}
}
