A single taxpayer who makes $40,739 per year in gross employment income has an 17 year old son who has a mental infirmity (but is not eligible to claim the disability tax credit). He pays $3,709 per year for after-school childcare and $138 per week for 2 weeks of overnight summer camp.

What is the maximum child care expense that the taxpayer can deduct when calculating their net inome for tax purposes?