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


int main() {
    int n,x,y;
    cin>>n>>x>>y;
    long long sum=0;
    while(n--)
        {
int a,b,c,d;
        cin>>a>>b>>c>>d;
    sum+=d;
        
    
    }
    cout<<sum;
        
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}