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def main():
    fish = 1
    while True:
        total, enough = fish, True
        for _ in range(5):
            if (total - 1) % 5 == 0:
                total = (total - 1) // 5 * 4
            else:
                enough = False
                break
        if enough:
            print(f'There are a total of {fish} fish')
            break
        fish += 1

if __name__ == '__main__':
    main()

There are a total of 3121 fish