How do I do this Equation?

Hey guys... I have one question... Somebody can halp me?

I have two range... one hange is input and other one is output.

Input

min-----max

0---------200

Output

min-----max

1---------3

-----

Exemple:

if i input a number 0, i have a number 1 output.

if i input a number 100, i have a number 2 output.

if i input a number 200, i have a number 3 output.

I need to know how to make some equation to have a output.

Question exemple:

If i input a number 75, i have what number output?

Thanks for the help!

output = (input/100)+1

output = (input/100)+1

That's it! Thank you.