def main():
    import sys
    input = sys.stdin.read().split()
    ptr = 0
    N = int(input[ptr])
    ptr += 1
    M = int(input[ptr])
    ptr += 1
    A = list(map(int, input[ptr:ptr+M])) if M > 0 else []
    a = [0] * (N + 1)
    for num in A:
        a[num] = 1
    
    S = [0] * (N + 1)
    
    for j in range(N, 0, -1):
        sum_multiples = 0
        k = 2 * j
        while k <= N:
            sum_multiples += S[k]
            k += j
        S[j] = (a[j] - sum_multiples) % 2
    
    total = sum(S)
    print(N - total)

if __name__ == "__main__":
    main()