sml multiple if statements

New to sml, I'm trying to find out how to write multiple if statements without them being nested. for example if im trying to find the median, I want:

if(a > b && b > c){return b;}
else if (b > a && a > c) {return a;}
else if (a > c && c > a) {return c;}

and so on and so forth

i tried this:

fun median(a,b,c) =
    if a > b andalso b > c then b
    else if b > a andalso a > c then a
    else if a > c andalso c > b then c

however it treats it as if they are all nested within one another. how would i make each if statement seperate