Remove Negative Values only in January

[astano05]

I have created the below 2 measure which work as expected. 

MPG Sold YTD-LY Chg SUM = sumx(filter(Customer,[MPGs Sold YTD-LY Chg threshold]>0),[MPGs Sold YTD-LY Chg threshold])

New MPG Sold = [MPG Sold YTD-LY Chg SUM]-calculate([MPG Sold YTD-LY Chg SUM],dateadd('Calendar'[Date Value],-1,MONTH))

However, the issue is with January there are many negative values when comparing January to December of the previous year. How can i filter out only the negative values in the New MPG Sold measure

[lbendlin]

return BLANK() for negative results.

Return if([value]>0,[value])

[lbendlin]

use MAX(0,[value])  to suppress negative values.

[astano05]

This works to change the negative values to 0, but I want my measure to calculate only for positive outcomes. Using MAX, causes it to show 0 for all values