def power(a,b):
	if b == 0:return 1
	if b % 2 != 0:
		return a * power(a,b - 1) % 1000003
	c = power(a,b/2)
	return c * c % 1000003
x,N = map(int,raw_input().split())
a = map(int,raw_input().split())
ans = 0
for i in range(N):
	ans += power(x,a[i])
ans %= 1000003
print ans