l, r, m = map(int, input().split())
fac = 1
now = 1
for i in range(l):
  fac *= i + 1
  fac %= m
  now *= fac
  now %= m
ans = 0
for i in range(l, r):
  if i % m == 0:
    break
  ans += now
  ans %= m
  fac *= i + 1
  fac %= m
  now *= fac
  now %= m
print(ans)