There is only one sharp in G minor: the F# in the harmonic and melodic minors.
The key signature for G minor is two flats, so the answer to your question is pretty much zero. Its leading tone, however, is F-sharp, always written with an accidental, so I suppose one could consider that there is one sharp in G minor, although not in the key signature.
Please also see the related link about the G minor scale.
5 sharps. F C G D A
The minor key with three sharps is B minor. In the key signature of B minor, the sharps are F#, C#, and G#. This key is the relative minor of D major, which also has two sharps in its key signature.
There are four sharps in C sharp minor. These sharps are C# D# F# and G#. The harmonic minor also has B#. (which is C)
B Major (and G sharp minor) has five sharps, but B minor only has two sharps (like D major).
The key with 7 sharps is B major. In this key, the notes are B, C#, D#, E, F#, G#, and A#. The relative minor of B major is G# minor, which also contains 7 sharps.
There are no sharps in the key signature, but in the harmonic minor there is a G#.
B major, or G sharp minor. The sharps are F, C, G, D and A. F#, C#, G#, D#, A#
5 sharps. F C G D A
F-sharp minor contains three sharps: F, C, and G.
The minor key with three sharps is B minor. In the key signature of B minor, the sharps are F#, C#, and G#. This key is the relative minor of D major, which also has two sharps in its key signature.
B Major and G sharp minor. The sharps are F, C, G, D, and A sharp, in that order.
G minor contains two flats: B and E.
There are four sharps in C sharp minor. These sharps are C# D# F# and G#. The harmonic minor also has B#. (which is C)
B Major (and G sharp minor) has five sharps, but B minor only has two sharps (like D major).
The key with 7 sharps is B major. In this key, the notes are B, C#, D#, E, F#, G#, and A#. The relative minor of B major is G# minor, which also contains 7 sharps.
A major has 3 sharps, A minor has no sharps or flats.
The natural minor has 5 and the harmonic minor has 4 and a double sharp.