#include <bits/stdc++.h>
#define endl '\n'
using namespace std;
const int32_t MAX_N = 20005;
string passwords[MAX_N];
map< string, bool > currSubstrings;
map< string, int32_t > substringsCnt;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int32_t n;
cin >> n;
for(int32_t i = 1; i <= n; i++) {
cin >> passwords[i];
}
for(int32_t i = 1; i <= n; i++) {
currSubstrings.clear();
for(int32_t l = 0; l < (int32_t) passwords[i].size(); l++) {
string curr = "";
for(int32_t r = l; r < (int32_t) passwords[i].size(); r++) {
curr += passwords[i][r];
if(currSubstrings.count(curr) == 0) {
currSubstrings[curr] = true;
substringsCnt[curr]++;
}
}
}
}
int32_t ans = 0;
for(int32_t i = 1; i <= n; i++) {
ans += substringsCnt[passwords[i]] - 1;
}
cout << ans << endl;
return 0;
}