L, R, M = map(int, input().split())
f = [1] * (M + 5)
ff = [1] * (M + 5)
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, M + 1)):
    ans += ff[i]
    ans %= M
print(ans)