im having trouble using the IF function. Basically i want to be able to create a cell that multiples several other cells as well as ADDS another. So far the formula works but if i do not enter any information into the other cells it shows a value of '1' which is really annoying. How can i edit my formula to avoid the '1'?

This is the formula i'm using:

IF(G5="",1,G5) * IF(H5="",1,H5) +I5 *IF(G5&H5="",0,1)