The number 4 is written on my whiteboard. every time it rains, i multiply the number on the whiteboard by 2/3, erase the original number, and write the new number on the whiteboard. when it snows, i multiply the number on the whiteboard by 3/5, and i replace the original number with the new number. it has rained 5 times and snowed 4 times this month. at the end of the month, what number is on the whiteboard?