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grammar A2;
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s : e {System.out.println($e.v);} ;
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e returns [int v]
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: a=e '*' b=e {$v = $a.v * $b.v;} -> Mult
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| a=e '+' b=e {$v = $a.v + $b.v;} -> Add
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| INT {$v = $INT.int;} -> Int
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| '(' x=e ')' {$v = $x.v;} -> Parens
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;
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INT : [0-9]+ ;
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WS : [ \t\n]+ -> skip ;
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