A gardener designs a rectangular herb garden divided into five regions, each planted with a different herb. The lengths, in feet, of the rectangular regions are as shown in the figure. She plants one herb per square foot in each region. The costs per square foot are: Basil $1, Chives $2, Dill $3, Sage $4, and Thyme $5. What is the least possible cost, in dollars, for her garden?