L, R, M = map(int, input().split())

if R >= M:
	print(0)
else:
	fact = 1
	mul = 1
	answer = 0
	for i in range(1, R + 1):
		fact = fact * i % M
		mul = mul * fact % M
		if i >= L:
			answer = (answer + mul) % M
	print(answer)