if/else statements help needed

Hi I am trying to complete a formula whereby I have four columns, of these four the first 3 will only ever had 1 completed so lets say its column a,b or c there will only ever be a 1 in one of these columns I then need to determine if there is a 1 in column d,

so basically the formula would in basic terms be something like this:

if d1=1 and a1 = 1 then 650, if d1 and b1 then 700, if d1 and c1 then 350

I would need this to be for all cells in the columns and totals at the bottom?

Hope I have explained this correctly