def main():
    import sys
    input = sys.stdin.read().split()
    idx = 0
    N = int(input[idx])
    idx += 1
    M = int(input[idx])
    idx += 1
    A = list(map(int, input[idx:idx + M]))
    
    f = [0] * (N + 1)
    for a in A:
        f[a] = 1
    
    s = [0] * (N + 1)
    
    for k in range(N, 0, -1):
        s[k] = f[k]
        m = 2 * k
        while m <= N:
            s[k] ^= s[m]
            m += k
    
    count = sum(s[1:N+1])
    print(N - count)

if __name__ == "__main__":
    main()