#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
struct str{int lat,lon,h,p;};
//bool cmp(str ss.p,str ss1.p){return (ss.p<ss1.p);}
str a[200005];
int x,y,n;
ull sum;
int main()
{
    ios_base::sync_with_stdio(0);
    cin>>n>>x>>y;
    for(int i=0;i<n;i++)
    {
        cin>>a[i].lat>>a[i].lon>>a[i].h>>a[i].p;
        sum+=(ull)a[i].p;
    }
    cout<<sum;
    return 0;
}