local l, r, m = io.read("*n", "*n", "*n")
if m <= l then
  print(0) os.exit()
end
if m <= r then
  r = m - 1
end
local fact = {1}
for i = 2, m - 1 do
  fact[i] = (fact[i - 1] * i) % m
end
local fact2 = {1}
for i = 2, m - 1 do
  fact2[i] = (fact2[i - 1] * fact[i]) % m
end
local ans = 0
for i = l, r do
  ans = ans + fact2[i]
end
print(ans % m)