import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;
import java.util.Stack;

class Main {
	public static void main(String[] $) {
		new Main().run();
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		int N=sc.nextInt();
		int[] A=new int[1<<20];
		int[] s=new int[1<<20];
		long ans=0;
		for (int i=0;i<N;++i) {
			int a=sc.nextInt();
			s[a]++;
			ans+=1L*a*N;
			A[a]++;
		}
		for (int i=s.length-2;i>=0;--i) {
			s[i]+=s[i+1];
		}
		for (int i=0;i<A.length;++i) {
			if (A[i]==0) continue;
			for (int a=i;a<s.length;a+=i) {
				ans-=1L*s[a]*i*A[i];
			}
		}
		System.out.println(ans);
		
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}