Calculate 4 fields plus a base number? Seems simple? Can't figure it out!

Im trying to calculate a total based on numbers typed into 4 fields - which works fine - however, I also have to add a number to that total (a base cost to which the other 4 fields will be added).  In the simplified field notation, I have the following: AACCgraphics+AACCFurniture+AACCFloor+AACCExtras+45500   With the addition of the +45500 into that script, it displays the initial total correctly in the total field, however it doesn't add any numbers from the other fields. I feel like this should be a simple thing to do, but I can't figure it out. Help!