Forgot to say

"which may throw out the fret count... " depending where in the sequence of the 12 chromatic notes you start.... and trying to remember the correct number of semitones (frets) for the correct number of steps in the scale is confusing for musical beginners, and varies with Major & Minor.

F G A B C is 5 notes from I to V in the scale of F Major - 7 semitones (frets)

C D E F G is 5 notes from I to V in the scale of C Major - 7 semitones (frets)

C D E F is 4 notes from I to V in the scale of C Major - 5 semitones (frets)