[mrtg] return value multiplication

[Ben]

I want to multiply the return value by 50 using the following:
Target[myhost]: 1.3.6.1.4.1.2021.9.1.7.2&1.3.6.1.4.1.2021.9.1.7.2:mystring at 192.168.101.2 * 50
(the MIB value is disk free space remain)
However, the return value is zero inside the log file. If I do not add * 50, the return value is fine. How could I solve it? Thanks!

Ben
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