using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Versioning;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp3 {
    class Program {
        static void Main(string[] args) {
            var scanner = new Scanner();
            int N = scanner.NextInt();
            long[] A = new long[N];
            long[] F = new long[400001];
            long total = 0;

            for (int i = 0; i < N; i++) {
                A[i] = scanner.NextInt();
                F[A[i]]++;
                total += A[i];
            }

            long[] S = new long[400002];
            for (int i = 0; i <= 400000; i++) {
                S[i + 1] = S[i] + F[i];
            }

            long answer = total * N;

            for (long i = 1; i <= 200000; i++) {
                for (long j = 0; i * j <= 200000; j++) {
                    answer -= i * j * (S[i * (j + 1)] - S[i * j]) * F[i];
                }
            }

            Console.WriteLine(answer);
        }
    }

    class Scanner {
        int index = 0;
        string[] tokens = { };

        public string Next() {
            if (index == tokens.Length) {
                index = 0;
                tokens = Console.ReadLine().Split(' ');
            }
            return tokens[index++];
        }

        public int NextInt() {
            return int.Parse(Next());
        }

        public long NextLong() {
            return long.Parse(Next());
        }

        public double NextDouble() {
            return double.Parse(Next());
        }
    }
}