Issues while joining two tables as the joining column has duplicate values - Please help!

Hi,
I have a table A -which has few columns including a Amount column - I am joining this table A to Table B. The joining column in B has duplicates. So, the number of records are getting more after the joining. As per the requirment when I create a table
after joining the tables and count the salary clumn, there is a difference in the counting. How can I solve this? Can you please help me?
Here is the DDL and sample values
create table #student (sid int, name varchar(10),salary int)
create table [#address] (sid int, city varchar(10),grade char(1),lineneumber int)
insert into #student values (1,'sachin',8000)
insert into #student values (2,'Dhoni',2000)
insert into #student values (3,'Ganguly',7000)
insert into #student values (4,'Kohli',1000)
insert into [#address] values(1,'mumbai','A',1)
insert into [#address] values(1,'mumbai','B',2)
insert into [#address] values(1,'mumbai','C',3)
insert into [#address] values(1,'mumbai','D',4)
insert into [#address] values(2,'JARKHAND','D',3)
insert into [#address] values(2,'JARKHAND','D',4)
SELECT S.SID,NAME,salary,CITY ,grade,linenumber
into #FINAL
FROM #STUDENT S
LEFT JOIN #ADDRESS A
ON S.SID=A.SID
SELECT SUM(salary) FROM #FINAL
--44000
Final result should be 18000 , but it is coming as 44000. can you please help me to get the correct result - what do i do in the joining?
In my real project, i have 5 tables joining, each table have more than 30 columns and few joining tables joining column have duplicates. I have simplified the issue so that i can ask the question clearly. So,while answering, please consider that also in mind.
thanks in advance for your help!

SELECT S.SID,NAME,salary,CITY
into #FINAL
FROM #STUDENT S
LEFT JOIN (SELECT DISTINCT sid,city
FROM #Address) A
ON S.SID=A.SIDthis will do a join on student table and city table with unique sid and city name so adddress selection will be sid city1 mumbai2 jarkand

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