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

def calc(N):
    N = min(N,M)
    ans = 0
    now = 1
    tmp = 1
    for i in range(1,N + 1):
        tmp *= i
        tmp %= M
        now *= tmp
        now %= M
        ans += now
        ans %= M
    return ans
print((calc(R) - calc(L - 1))%M)