#include <bits/stdc++.h>
#define PB push_back
#define EB emplace_back
using namespace std;
typedef pair<int, int> pii;
const int maxn = 1000000, maxl = 2000000;
char str[maxl + 5];
int len[maxn + 5];
vector<int> pre[maxn + 5];
int pcnt;
int nxt[maxl + 5][26];
int id[maxl + 5];
int f[maxl + 5], jmp[maxl + 5];
vector<int> t[maxl + 5];
void insert(int n, int x) {
	pre[x].resize(n + 1);
	int p = 0;
	for (int i = 1; i <= n; i++) {
		int c = str[i] - 'a';
		if (!nxt[p][c]) nxt[p][c] = ++pcnt;
		pre[x][i] = p = nxt[p][c];
	}
	id[p] = x;
}
void build() {
	queue<int> q;
	for (int i = 0; i < 26; i++)
		if (nxt[0][i]) {
			t[0].PB(nxt[0][i]);
			q.push(nxt[0][i]);
		}
	while (!q.empty()) {
		int u = q.front(); q.pop();
		for (int i = 0; i < 26; i++) {
			int& v = nxt[u][i];
			if (v) {
				f[v] = nxt[f[u]][i];
				t[nxt[f[u]][i]].PB(v);
				q.push(v);
			} else v = nxt[f[u]][i];
		}
	}
}
int st[maxl + 5], ed[maxl + 5], stamp;
void dfs(int u) {
	st[u] = ++stamp;
	if (id[u]) jmp[u] = u;
	for (int v : t[u]) {
		jmp[v] = jmp[u];
		dfs(v);
	}
	ed[u] = stamp;
}
vector<pii> L[maxn + 5];
int s[maxl + 5];
void modify1(int x, int v) {
	for (; x <= pcnt; x += x & (-x)) s[x] += v;
}
int query1(int x) {
	int rs = 0;
	for (; x; x -= x & (-x)) rs += s[x];
	return rs;
}
int query1(int l, int r) { return query1(r) - query1(l - 1); }
int c[maxl + 5], nl;
void modify2(int x, int v) {
	for (; x <= nl; x += x & (-x)) c[x] = (c[x] && c[x] != v) ? -1 : v;
}
int query2(int x) {
	int rs = 0;
	for (; x; x -= x & (-x))
		if (c[x]) rs = (!rs || rs == c[x]) ? c[x] : -1;
	return rs;
}
int ic[maxl + 5];
int main() {
	int n;
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) {
		scanf("%s", str + 1);
		insert(len[i] = strlen(str + 1), i);
	}
	build(), dfs(0);
	int ans = 0;
	for (int i = 1; i <= n; i++) {
		vector<int> cl1, cl2;
		nl = len[i];
		for (int j = 1; j <= nl; j++) {
			int x = pre[i][j];
			if (!id[x]) x = jmp[x];
			if (j == nl) x = jmp[f[x]];
			for (int c = 0; c < 2 && x; c++) {
				L[j].EB(j - len[id[x]] + 1, x);
				x = jmp[f[x]]; 
			}
			if (x) modify1(st[x], 1), cl1.PB(st[x]);
		}
		for (int j = nl; j; j--) {
			for (const auto& [l, x] : L[j]) {
				if (query1(st[x], ed[x])) continue;
				int rs = query2(l);
				if (rs) ic[x] = (!ic[x] || ic[x] == rs) ? rs : -1, cl2.PB(x);
				modify2(l, x);
			}
		}
		for (int x : cl1) modify1(x, -1);
		for (int x : cl2) {
			ans += ic[x] > 0;
			ic[x] = 0;
		}
		memset(c + 1, 0, nl * sizeof(int));
		fill(L + 1, L + nl + 1, vector<pii>());
	}
	printf("%d", ans);
}