How to Change values depending on Number input on Form?

I have a text field on my form labelled "M1" on my pdf.   The value of M1 will always be a number ranging from 1-6.

I have three additional text fields on the form labelled T1, T2 and T3.

I would like the values of T1 T2 & T3 to change, depending on what number I type in M1

For example,

If I type the number "1" in M1, i would like  T1 =1, T2 is left empty, and T3  left empty

If I type in the number "2"     T1= "1-2"      T2=left empty,      and T3 left empty.

If I type in the number "3"    T1= "1-2"       T2=3,                     and T3 left empty.

If I type in the number "4"    T1= "1-2"      T2=3-4,                     and T3 left empty.

If I type in the number "5"    T1= "1-2"      T2=3-4,                     and T3= 5

If I type in the number "6"    T1= "1-2"      T2=3-4,                     and T3= 5-6

Your help would be greatly appreciated!