def keisan(x, N, a):
    result = 0
    for i in range(N):
        result += x ** a[i]
    return result % 1000003

def main():
    x, N = map(int, input().split())
    a_li =list(map(int, input().split()))
    print(keisan(x, N, a_li))

if __name__ == '__main__':
    main()