M = int(input())
N = int(input())
C = sorted([int(i) for i in input().split()])
prime = [True for i in range(M + 1)]
dp = [-1 for i in range(M + 1)]
prime[0] = prime[1] = False
for i in range(2,M + 1):
	if prime[i]:
		j = 2
		while i * j <= M:
			prime[i * j] = False
			j+=1
dp[M] = 0
for i in range(N):
	for j in range(M,-1,-1):
		if dp[j] != -1:
			k = 0
			while j - C[i] * k >= 0:
				dp[j - C[i] * k] = max(dp[j - C[i] * k],dp[j] + k)
				k += 1
ans = 0
for i in range(M + 1):
	if prime[i] and dp[i] >= 0:
		ans += dp[i]
ans += M // C[0]
print(ans)