N = int(input())
l_ans = []

for i in range(N):
    S = input()
    l = list(S)
    l = [10 if x == "A" else 11 if x == "B" else 12 if x == "C" else 13 if x == "D" else 14 if x == "E" else 15 if x == "F" else 16 if x == "G" else 17 if x == "H" else 18 if x == "I" else 19 if x == "J" else 20 if x == "K" else 21 if x == "L" else 22 if x == "M" else 23 if x == "N" else 24 if x == "O" else 25 if x == "P" else 26 if x == "Q" else 27 if x == "R" else 28 if x == "S" else 29 if x == "T" else 30 if x == "U" else 31 if x == "V" else 32 if x == "W" else 33 if x == "X" else 34 if x == "Y" else 35 if x == "Z" else int(x) for x in l]
    l_max = max(l)
    tei = l_max + 1
    l.reverse()
    ans = 0
    for i in range(len(l)):
        ans += tei ** i * l[i]
    l_ans.append(ans)

print(min(l_ans))