$set intlevel(4)
 identification division.
 program-id. calculate.

 environment division.

 data division.
 working-storage section.
 01 calmemory      pic s9(9) comp-5 value 0.

 linkage section.
 01 calculator.
    05 arg1        pic s9(19)v9(19) comp-3.
    05 arg2        pic s9(19)v9(19) comp-3.
    05 result      pic s9(19)v9(19) comp-3.
    05 storage     pic s9(19)v9(19) comp-3.

 procedure division.
     exit program.

 entry "add" using calculator.
     move arg1 to result
     add  arg2 to result
     add  result to calmemory
     move calmemory to storage
     exit program.

 entry "subtract" using calculator.
     move arg1 to result
     subtract arg2 from result
     add  result to calmemory
     move calmemory to storage
     exit program.

 entry "multiply" using calculator.
     move arg1 to result
     multiply arg2 by result
     add  result to calmemory
     move calmemory to storage
     exit program.

 entry "divide" using calculator.
     move arg1 to result
     divide arg2 into result
     add  result to calmemory
     move calmemory to storage
     exit program.