from math import inf
from string import ascii_uppercase

alphabet_num = {letter: idx for idx, letter in enumerate(ascii_uppercase, 10)}
alphabet_num.update({str(idx): idx for idx in range(10)})
num_alphabet = {num: letter for letter, num in alphabet_num.items()}


def inference_base_10(num_str: str) -> int:
    minimum = inf
    for base_ in range(2, 37):
        try:
            minimum = min(minimum, calc_base_n(num_str, base_))
        except ValueError:
            pass
    return minimum


def calc_base_n(num_str: str, n: int) -> int:
    num_base_10 = 0
    for idx, num in enumerate(reversed(num_str)):
        if alphabet_num[num] >= n:
            raise ValueError
        num_base_10 += alphabet_num[num] * n**idx
    return num_base_10


def main():
    minimum = inf
    for _ in range(int(input())):
        num = input()
        minimum = min(minimum, inference_base_10(num))
    print(minimum)


if __name__ == "__main__":
    main()