#include <bits/stdc++.h>
using namespace std;
const int N = 2e4 + 5;
string a[N];
bool check(string &x, string &y){
int l = 0, r = 0;
int n = x.size(), m = y.size();
while (l < n && r < m){
if (x[l] == y[r]){
l++;
r++;
}
else r++;
}
return l == n;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n; cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
int ans = 0;
for (int i = 1; i <= n; i++)
for (int j = 1; j <= n; j++)
if (i != j) ans += check(a[j], a[i]);
cout << ans;
return 0;
}
