#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int n,x,y,z;
    cin>>n>>y>>z;
    int a[n],b[n],c[n];
    for(int i=0;i<n;i++)
        {
        cin>>x>>a[i];
        cin>>b[i]>>c[i];
    }
    long long s=0;
     for(int i=0;i<n;i++)
        {
        s=s+c[i];
    }
    cout<<s;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    return 0;
}