#include <cstdio>
#include <string>

namespace nachia{


const unsigned int INPUT_BUF_SIZE = 2 << 20;
const unsigned int OUTPUT_BUF_SIZE = 1 << 20;

char input_buf[INPUT_BUF_SIZE];

struct input_buf_init{
    input_buf_init(){
        input_buf[fread(input_buf, 1, INPUT_BUF_SIZE-1, stdin)] = '\0';
    }
} input_buf_init_instance;

struct input_buf_iterator{
private:
    unsigned int p = 0;
public:
    static bool is_whitespace(char ch){
        switch(ch){
            case ' ': case '\n': case '\r': case '\t': return true;
        }
        return false;
    }
    void skip_whitespace(){
        while(is_whitespace(input_buf[p])) p++;
    }
    unsigned int next_uint(){
        skip_whitespace();
        unsigned int buf = 0;
        while(true){
            char tmp = input_buf[p];
            if('9' < tmp || tmp < '0') break;
            buf = buf * 10 + (tmp - '0');
            p++;
        }
        return buf;
    }
    int next_int(){
        skip_whitespace();
        if(input_buf[p] == '-'){
            p++;
            return (int)(-next_uint());
        }
        return (int)next_uint();
    }
    unsigned long long next_ulong(){
        skip_whitespace();
        unsigned long long buf = 0;
        while(true){
            char tmp = input_buf[p];
            if('9' < tmp || tmp < '0') break;
            buf = buf * 10 + (tmp - '0');
            p++;
        }
        return buf;
    }
    long long next_long(){
        skip_whitespace();
        if(input_buf[p] == '-'){
            p++;
            return (long long)(-next_ulong());
        }
        return (long long)next_ulong();
    }
    char next_char(){
        skip_whitespace();
        return input_buf[p++];
    }
    std::string next_token(){
        skip_whitespace();
        std::string buf;
        while(true){
            char ch = input_buf[p];
            if(is_whitespace(ch)) break;
            buf.push_back(ch);
            p++;
        }
        return buf;
    }
};


char output_buf[OUTPUT_BUF_SIZE] = {};

struct fastoutput_table{
    char dig3lz[1000][4];
    char dig3nlz[1000][4];
    fastoutput_table(){
        for(unsigned int d=0; d<1000; d++){
            unsigned int x = d;
            unsigned int i = 0;
            dig3lz[d][i++] = ('0' + x / 100 % 10);
            dig3lz[d][i++] = ('0' + x /  10 % 10);
            dig3lz[d][i++] = ('0' + x /   1 % 10);
            dig3lz[d][i++] = '\0';
        }
        for(unsigned int d=0; d<1000; d++){
            unsigned int x = d;
            unsigned int i = 0;
            if(x >= 100) dig3nlz[d][i++] = ('0' + x / 100 % 10);
            if(x >=  10) dig3nlz[d][i++] = ('0' + x /  10 % 10);
            if(x >=   1) dig3nlz[d][i++] = ('0' + x /   1 % 10);
            dig3nlz[d][i++] = '\0';
        }
    }
} fastoutput_table_inst;

struct output_buf_iterator{
    unsigned int p = 0;
    void next_char(char c){
        output_buf[p++] = c;
    }
    void next_eoln(){
        next_char('\n');
    }
    void next_cstr(char* s){
        int i = 0;
        while(s[i]) next_char(s[i++]);
    }
    void next_dig9(unsigned int x){
        unsigned int y;
        y = x / 1'000'000;     x -= y * 1'000'000;
        next_cstr(fastoutput_table_inst.dig3lz [y]);
        y = x / 1'000;         x -= y * 1'000;
        next_cstr(fastoutput_table_inst.dig3lz [y]);
        y = x;
        next_cstr(fastoutput_table_inst.dig3lz [y]);
    }
    void next_uint(unsigned int x){
        unsigned int y = 0;
        if(x >= 1'000'000'000){
            y = x / 1'000'000'000; x -= y * 1'000'000'000;
            next_cstr(fastoutput_table_inst.dig3nlz[y]);
            next_dig9(x);
        }
        else if(x >= 1'000'000){
            y = x / 1'000'000;     x -= y * 1'000'000;
            next_cstr(fastoutput_table_inst.dig3nlz[y]);
            y = x / 1'000;         x -= y * 1'000;
            next_cstr(fastoutput_table_inst.dig3lz [y]);
            next_cstr(fastoutput_table_inst.dig3lz [x]);
        }
        else if(x >= 1'000){
            y = x / 1'000;         x -= y * 1'000;
            next_cstr(fastoutput_table_inst.dig3nlz[y]);
            next_cstr(fastoutput_table_inst.dig3lz [x]);
        }
        else if(x >= 1){
            next_cstr(fastoutput_table_inst.dig3nlz[x]);
        }
        else{
            next_char('0');
        }
    }
    void next_ulong(unsigned long long x){
        unsigned int y = 0;
        if(x >= 1'000'000'000'000'000'000){
            y = x / 1'000'000'000'000'000'000; x -= (unsigned long long)y * 1'000'000'000'000'000'000;
            next_uint(y);
            y = x / 1'000'000'000; x -= (unsigned long long)y * 1'000'000'000;
            next_dig9(y);
            next_dig9(x);
        }
        else if(x >= 1'000'000'000){
            y = x / 1'000'000'000; x -= (unsigned long long)y * 1'000'000'000;
            next_uint(y);
            next_dig9(x);
        }
        else{
            next_uint(x);
        }
    }
    void write_to_file(){
        fwrite(output_buf, p, 1, stdout);
    }
};

} // namespace nachia


#include <vector>
#include <algorithm>
#include <cassert>
#include <iostream>


namespace nachia{

namespace prime_sieve_explicit_internal{
    std::vector<bool> isprime = { false }; // a[x] := isprime(2x+1)

    void CalcIsPrime(int z){
        if((int)isprime.size() *2+1 < z+1){
            int new_z = isprime.size();
            while(new_z*2+1 < z+1) new_z *= 2;
            z = new_z-1;
            isprime.resize(z+1, true);
            for(int i=1; i*(i+1)*2<=z; i++) if(isprime[i]){
                for(int j=i*(i+1)*2; j<=z; j+=i*2+1) isprime[j] = false;
            }
        }
    }
    
    std::vector<int> prime_list = {2};
    int prime_list_max = 0;

    void CalcPrimeList(int z){
        while((int)prime_list.size() < z){
            if((int)isprime.size() <= prime_list_max + 1) CalcIsPrime(prime_list_max + 1);
            for(int p=prime_list_max+1; p<(int)isprime.size(); p++){
                if(isprime[p]) prime_list.push_back(p*2+1);
            }
            prime_list_max = isprime.size() - 1;
        }
    }
    
    void CalcPrimeListUntil(int z){
        if(prime_list_max < z){
            CalcIsPrime(z);
            for(int p=prime_list_max+1; p<(int)isprime.size(); p++){
                if(isprime[p]) prime_list.push_back(p*2+1);
            }
            prime_list_max = isprime.size() - 1;
        }
    }

}


bool IsprimeExplicit(int n){
    using namespace prime_sieve_explicit_internal;
    if(n == 2) return true;
    if(n % 2 == 0) return false;
    CalcIsPrime(n);
    return isprime[(n-1)/2];
}

int NthPrimeExplicit(int n){
    using namespace prime_sieve_explicit_internal;
    CalcPrimeList(n);
    return prime_list[n];
}

int PrimeCountingExplicit(int n){
    using namespace prime_sieve_explicit_internal;
    if(n < 2) return 0;
    CalcPrimeListUntil(n);
    auto res = ::std::upper_bound(prime_list.begin(), prime_list.end(), n) - prime_list.begin();
    return (int)res;
}

// [l, r)
::std::vector<bool> SegmentedSieveExplicit(long long l, long long r){
    assert(0 <= l); assert(l <= r);
    long long d = r - l;
    if(d == 0) return {};
    ::std::vector<bool> res(d, true);
    for(long long p=2; p*p<=r; p++) if(IsprimeExplicit(p)){
        long long il = (l+p-1)/p, ir = (r+p-1)/p;
        if(il <= p) il = p;
        for(long long i=il; i<ir; i++) res[i*p-l] = false;
    }
    if(l < 2) for(long long p=l; p<2 && p<r; p++) res[l-p] = false;
    return res;
}


}


namespace nachia{

template<class Elem>
void DivisorZeta(std::vector<Elem>& a){
    using namespace prime_sieve_explicit_internal;
    int n = a.size() - 1;
    for(int d=2; d<=n; d++) if(IsprimeExplicit(d)) for(int i=1; i*d<=n; i++) a[i*d] += a[i];
}

template<class Elem>
void DivisorInvZeta(std::vector<Elem>& a){
    using namespace prime_sieve_explicit_internal;
    int n = a.size() - 1;
    for(int d=2; d<=n; d++) if(IsprimeExplicit(d)) for(int i=n/d; i>=1; i--) a[i] += a[i*d];
}

template<class Elem>
void DivisorMobius(std::vector<Elem>& a){
    using namespace prime_sieve_explicit_internal;
    int n = a.size() - 1;
    for(int d=2; d<=n; d++) if(IsprimeExplicit(d)) for(int i=n/d; i>=1; i--) a[i*d] -= a[i];
}

template<class Elem>
void DivisorInvMobius(std::vector<Elem>& a){
    using namespace prime_sieve_explicit_internal;
    int n = a.size() - 1;
    for(int d=2; d<=n; d++) if(IsprimeExplicit(d)) for(int i=1; i*d<=n; i++) a[i] -= a[i*d];
}

template<class Elem>
std::vector<Elem> GcdConvolution(std::vector<Elem> a, std::vector<Elem> b){
    assert(a.size() == b.size());
    assert(1 <= a.size());
    DivisorInvZeta(a);
    DivisorInvZeta(b);
    for(int i=1; i<(int)a.size(); i++) a[i] *= b[i];
    DivisorInvMobius(a);
    return a;
}

template<class Elem>
std::vector<Elem> LcmConvolution(std::vector<Elem> a, std::vector<Elem> b){
    assert(a.size() == b.size());
    assert(1 <= a.size());
    DivisorZeta(a);
    DivisorZeta(b);
    for(int i=1; i<(int)a.size(); i++) a[i] *= b[i];
    DivisorMobius(a);
    return a;
}

}

#include <string>
#include <array>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;

using modint = atcoder::static_modint<998244353>;

int main(){
    nachia::input_buf_iterator iitr;
    nachia::output_buf_iterator oitr;
    int N = iitr.next_uint();
    int M = iitr.next_uint();
    vector<int> A(N+1, 0);
    rep(i,M){ A[iitr.next_uint()] = 1; }
    nachia::DivisorInvMobius(A);
    int ans = 0;
    rep(i,N) if(A[i+1] % 2 == 0) ans++;
    oitr.next_uint(ans);
    oitr.next_eoln();
    oitr.write_to_file();
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;