the 1 is A
the b3 is B (because the 3 is C)
and the 5 is E
So 1 - b3 - 5 for the Am chord is A - B - E
No, but at least this is the right question to ask here. And you are correct something looks wrong..
Start with the A Major Scale - A, B,C#,D,E,F#, G #
For a natural minor chord in this scale, 1=A, b3 = C and 5 = E
It works like this for any Nat Minor Chord in any scale.