You need some basic array processing.
1. Declare an array
array ais(*) abd_ais ext_ais .... ; *list of ais vars;
2. Set to 75 if necessary.
If max(of ais(*))>5 then iss=75;
3. Else sure the 3 largest values - Use LARGEST() function.
else iss = largest(1, of ais(*))**2 + largest(2, of ais(*))**2 + largest(3, of ais(*))**2;
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