L, R, M = map(int, input().split())
f = [0] * (M + 5)
ff = [0] * (M + 5)
f[0] = ff[0] = 1
for i in range(M):
    f[i + 1] = f[i] * (i + 1) % M
for i in range(M):
    ff[i + 1] = ff[i] * f[i + 1] % M

ans = 0
for i in range(L, min(R + 1, M + 1)):
    ans += ff[i]
    ans %= M
print(ans)