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

N = MOD
fact = [1]
ff = [1]
for n in range(1,N+1):
    fact.append(fact[-1]*n%MOD)
    ff.append(ff[-1]*fact[-1]%MOD)

ans = 0
if L<MOD:
    for i in range(L,R+1):
        if ff[i]==0:
            break
        ans = (ans+ff[i])%MOD
print(ans)