L,R,M = map(int,input().split())
ans = 0
t1 = 1
t2 = 1
for i in range(1,min(R+1,M)):
    t1 *= i
    t1 %= M
    t2 *= t1
    t2 %= M
    if i >= L:
        ans += t2
        ans %= M
print(ans)