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

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

R = min(R + 1, M)
a, b = 1, 1

for i in range(2, L):
    a *= i
    a %= M
    b *= a
    b %= M

ans = 0

for i in range(L, R):
    a *= i
    a %= M
    b *= a
    b %= M
    ans += b
    ans %= M

print(ans)