A rich man died. In his will, he has divided his gold coins among his 5 sons, 5 daughters and a manager. According to his will:
- First give one coin to manager, and 1/5th of the remaining to the eldest son.
- Now give one coin to the manager, and 1/5th of the remaining to the second son, and so on and so forth.
- After giving coins to the 5th son, divide the remaining coins among five daughters equally.
- Everyone gets an integer number of coins.
What is the minimum number of coins that the rich man had left behind?