[[File:PietArithmaticInteger.png]]<br>
 <code>
 command   stack
 in(int)   A
 duplicate AA
 duplicate AAA
 duplicate AAAA
 duplicate AAAAA
 in(int)   BAAAAA
 duplicate BBAAAAA
 duplicate BBBAAAAA
 duplicate BBBBAAAAA
 duplicate BBBBBAAAAA
 push 9    9BBBBBAAAAA
 push 1    19BBBBBAAAAA
 roll      BBBBAAAABA
 push 7    7BBBBAAAABA
 push 1    17BBBBAAAABA
 roll      BBBAAABABA
 push 5    5BBBAAABABA
 push 1    15BBBAAABABA
 roll      BBAABABABA
 push 3    3BBAABABABA
 push 1    13BBAABABABA
 roll      BABABABABA
 add       (A+B)BABABABA
 out(int)  BABABABA
 sub       (A-B)BABABA
 out(int)  BABABA
 mult      (A*B)BABA
 out(int)  BABA
 divide    (A/B)BA
 out(int)  BA
 mod       (A%B)
 out(int)  NULL
 push 1    1
 exit</code>
How rounding is handled is up to the interpreter, but I believe the intent was round towards 0.