Codeforces Round #376 (Div. 2) F. Video Cards

#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn=1000100;

int a[maxn],num[maxn];
int n,x;

int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&x);
        a[x]++;
    }
    for(int i=200000;i>=1;i--) num[i]=num[i+1]+a[i];
    ll sum=0;
    for(int i=1;i<=200000;i++)
    {
        if(a[i])
        {
            ll cnt=0;
            for(int j=i;j<=200000;j+=i) cnt+=(ll)(num[j]-num[j+i])*j;
            sum=max(sum,cnt); 
        }
    }
    printf("%lld\n",sum);
}