inputer_s = input()
inputer_data = inputer_s.split(" ")

first_d = int(inputer_data[0])
second_d = int(inputer_data[1])
third_d = int(inputer_data[2])
forth_d=int(inputer_data[3])

first_d =  int(first_d%forth_d)
second_d =  int(second_d%forth_d)
third_d =  int(third_d%forth_d)

first_second = (first_d*second_d)%forth_d
result=(first_second*third_d)%forth_d

print(result)