I need help solving this question

Riley operates a plumbing business and this year the 3-year old van he used in the business was destroyed in a traffic accident. The van was originally purchased for $23,400 and the adjusted basis was $5,375 at the time of the accident. Although the van was worth $6,340 at the time of accident, insurance only paid Riley $1,625 for the loss. What is the amount of Riley's casualty loss deduction?