get no of inputs is possible or not?

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SQL-Server-2012

declare

a number;
b number;
c number;
i numner(2):=1;
n number;
BEGIN
n:=&n;
loop
if i<n mode="hold">a:=&a;
b:=&b;
c:=a+b;
dbms_output.put_line('result'||c);
i:=i+1;
end if;
end loop;

END;