#include <bits/stdc++.h>

using namespace std;

int main(){
   long long int n;
    long long int x;
    long long int y,sum=0;
    cin >> n >> x >> y;
    for(int a0 = 0; a0 < n; a0++){
        long long int latitude;
        long long int longitude;
        long long int height;
        long long int points;
        cin >> latitude >> longitude >> height >> points;
        // your code goes here
        sum+=points;
    }
    cout<<sum<<endl;
    return 0;
}