#include<stdio.h>
#include<algorithm>
#include<set>
using namespace std;

#define pi pair<int,int>
#define x first
#define y second
#define mp make_pair
#define NMAX 100006

multiset <int> myset;
int stlp[NMAX],cost[NMAX];
pi intra[NMAX],iese[NMAX];
int d[NMAX],n,aprin[NMAX];

int main ()
{
    int i,poz,poz1,poz2,a,c,b;
    
    freopen("stalpi.in","r",stdin);
    freopen("stalpi.out","w",stdout);
    scanf("%d",&n);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d%d%d",&a,&cost[i],&c,&b);
        intra[i]=mp(a-c,i);
        iese[i]=mp(a+b+1,i);
        stlp[i]=a;
    }
    sort(intra+1,intra+n+1);
    sort(iese+1,iese+n+1);
    sort(stlp+1,stlp+n+1);
    poz1=poz2=1;
    for(i=1;i<=n;i++)
    {
        while(poz1<=n && intra[poz1].x<=stlp[i])
        {
            poz=intra[poz1].y;
            aprin[poz]=d[i-1]+cost[poz];
            myset.insert(aprin[poz]);
            poz1++;
        }
        while(poz2<=n && iese[poz2].x<=stlp[i])
        {
            poz=iese[poz2].y;
            myset.erase(aprin[poz]);
            poz2++;
        }
        d[i]=*myset.begin();
    }
    printf("%d\n",d[n]);
    return 0;
}