#include<bits/stdc++.h>
using namespace std;

const int MAX = 1e6;
vector<long long> lp(1000010, 0), pr;
struct Make_Table{
    Make_Table(){
        for(int i = 2; i <= MAX; i++){
            if(!lp[i]){
                lp[i] = i;
                pr.push_back(i);
            }
            for(int j = 0; j < (int)pr.size() and pr[j] <= lp[i] and i * pr[j] <= MAX; j++){
                lp[i * pr[j]] = pr[j];
            }
        }
    }
}Make_Table_;

long long res;
int a;
map<int, int> mp;
void solve(){
    res -= a;
    mp.clear();
    while(lp[a]){
        mp[lp[a]]++;
        a = a / lp[a];
    }
    if(a != 1) mp[a]++;
    int pre = 1;
    for(auto p : mp) pre *= pow(p.first, p.second - 1) * ((p.first - 1) * p.second + p.first);
    res += pre;
}

int main(){
    int n, m;
    cin >> n >> m;
    while(cin >> a) solve();
    cout << res << '\n';
}