l, r, m = map(int, input().split())

if l >= m:
	print(0)
	exit()

fact = [1] * m
for i in range(1, m):
	fact[i] = fact[i - 1] * i % m

fact_cum_prd = [1] * m
for i in range(1, m):
	fact_cum_prd[i] = fact_cum_prd[i - 1] * fact[i] % m

ans = 0
for i in range(l, min(r + 1, m)):
	ans += fact_cum_prd[i]
	ans %= m

print(ans)