Converting a value to a number

Hi,

Please find a small program code.

data : a(18),

result = a * 25 * 36 / 12.

My question is ..

'a' has a value 4,589. If I use this value in the calculation part, it gives me a dump.

I need to interpret this value as a number and use it for the calculation.

Kindly help me.

Thanks in advance.