def main():
    l, r, m = map(int, input().split())
    if l > m:
        l = m
    if r > m:
        r = m
    f = [0] * (m + 1)
    f[0] = 1
    for i in range(1, m + 1):
        f[i] = i * f[i - 1] % m
    ff = [0] * (m + 1)
    ff[0] = 1
    for i in range(1, m + 1):
        ff[i] = f[i] * ff[i - 1] % m
    ans = 0
    for i in range(l, r + 1):
        ans += ff[i]
        ans %= m
    print(ans)
main()