#!/usr/bin/env python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from operator import itemgetter

N = int(readline())
S = read().split()

answer = 0
for word in S:
    answer += len(word)

LCP = [0] * (N - 1)
for i, (w1, w2) in enumerate(zip(S, S[1:])):
    L1 = len(w1)
    L2 = len(w2)
    j = 0
    while j < L1 and j < L2 and w1[j] == w2[j]:
        j += 1
    LCP[i] = j

INF = 10 ** 6
LCP.insert(0, -INF)
LCP.append(-INF)
values = sorted(enumerate(LCP), key=itemgetter(1), reverse=True)

left = list(range(1, N + 2))
right = list(range(-1, N))


for i, value in values[:-2]:
    l = left[i - 1]
    r = right[i + 1]
    left[r] = l
    right[l] = r
    cnt = (i - l + 1) * (r - i + 1)
    answer += value * cnt * (r - l + 4) // 2

print(answer)