Find a number a using strange computer

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IN the $\#1$ slot of the computer memory there is number $a$. The computer is able to sum, multiply, divide and subtract from selected slots, writing the result in to the selected slot. It is also able to say about the number in the selected slot whether it is positive, negative or equals zero. The computer doesn't give any more information and it is not possible to write any numbers by yourself (it is possible to work only with number $a$ and its results with other numbers). How to find the number $a$ approximately, to a precision of $\frac{1}{1000000}$?