#include <vector>
#include <iostream>
using i64 = std::int_fast64_t;

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(nullptr);

	int n; scanf("%d", &n);
	std::vector<std::string> s(n);
	for(int i = 0; i < n; i++) std::cin >> s[i];

	std::vector<i64> a(n - 1);
	for(int i = 0; i < n - 1; i++) {
		for(int j = 0; j < std::min(s[i + 1].size(), s[i].size()); j++) {
			if(s[i][j] != s[i + 1][j]) break;

			a[i] = j + 1;
		}
	}

	i64 ans = 0;
	for(auto v: s) ans += v.size();

	std::vector<int> nxt(a.size());
	for(int i = (int)a.size() - 1; i >= 0; i--) {
		int now = i + 1;
		while(now < a.size()) {
			if(a[now] < a[i]) break;
			now = nxt[now];
		}
		nxt[i] = now;
	}

	for(int i = 0; i < a.size(); i++) {
		int now = i;
		while(now < a.size() and a[now]) {
			i64 S = now - i + 2, T = nxt[now] - i + 1;
			i64 len = (S + T) * (T - S + 1) >> 1;

			ans += len * a[now];
			now = nxt[now];
		}
	}

	printf("%lld\n", ans);
	return 0;
}