Using multiple arguments in a formula

I'm trying to create a formula where if the resultant value of a cell return a value as follows

if 4=4
if <4 but greater than or equal to 3.5 = 3.5
if <3.5 but greater than or equal to 3 = 3
if <3 but greater than or equal to 2 = 2
if <2 =1

thanks

There are numerous ways to do this, but the shortest is probably:

=INDEX({1,2,3,3.5,4},MATCH(A1,{0,2,3,3.5,4},1))

Assuming your resultant value is in A1.

Probably the most obvious way, again with the value in A1 is:

=IF(A1<2,1,IF(A1<3,2,IF(A1<3.5,3,IF(A1<4,3.5,4))))