mod = 1000003
x, N = map(int,input().split())
A = list(map(int,input().split()))
A.sort()
pow1 = min(A)
x0 = (x**pow1)%mod
ans = x0
for i in range(1,N):
    pow2 = A[i]
    x0 *= x**(pow2-pow1)
    ans += x0
    ans %= mod
    pow1 = pow2
print(ans)