Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.
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1000+20+1000+30+1000+40+1000+10
1000+1000+1000+1000= 4000 10+20+30+40= 100
4000+100= 4100