L, R, M = map(int, input().split())

if L >= M:
    print(0)
    exit()

R = min(M - 1, R)

f = [1]
fac = 1
for n in range(1, M):
    fac = (fac * n) % M
    f.append((fac * f[-1]) % M)

ans = 0
for n in range(L, R + 1):
    ans = (ans + f[n]) % M

print(ans)