What’s the highest critical hit damage a level 1 character can do?

What’s the highest critical hit damage a level 1 character can do?

Rules:

• The character must be level 1
• The character cannot have any magical items
• The character’s starting equipment must be affordable with the standard 15 gp start
• The character can be assisted by up to three other level 1 characters with the same restrictions
• The three assistant characters each have one round before the primary character makes their attack
• The damage must come off of one critical hit (i.e. the first hit of Flurry of Blows, not both)
• Max damage can be assumed