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. **/
using namespace std;
typedef long long LL;
const double PI = acos(-1.0);
typedef pair<int, int> Author;
vector<pair<string, int> > VP;
LL qkm(LL a, LL b, LL c){
LL res = 1;
for(a %= c; b; b >>= 1, a = a * a % c) if(b & 1) res = res * a % c;
return res;
}
inline int max(int a, int b){return a > b ? a : b;}
inline int min(int a, int b){return a > b ? b : a;}
struct Node{
string name;
}people[MAX];
long long gcd(long long a,long long b){
return b==0?a:gcd(b,a%b);
}
int cmp(const Node& a, const Node& b){
return a.name.size() < b.name.size();
}
/***********************************************************************************************************************************/
int n, m, len, temp;
LL a[22], ans;
void DFS(int index, LL lcm, int id){ //奇数加，偶数减，最后判断下标即可
lcm = a[index] / __gcd(a[index], lcm) * lcm;
//容斥原理，小于n，故不包含n
if(id & 1) ans += (n - 1) / lcm;
else ans -= (n - 1) / lcm;
//下一个数，lcm，id + 1;
FFI(index + 1, len) DFS(i, lcm, id + 1);
}
int main(void){
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
ios::sync_with_stdio(false); cin.tie(0);
while(cin>>n>>m){
len = ans = 0;
while(m--){
cin>>temp;
if(temp) a[len++] = temp;
}
FFI(0, len) DFS(i, a[i], 1);
cout<<ans<<endl;
}
return EXIT_SUCCESS;
}
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