#include <bits/stdc++.h>
using namespace std;
#define ll long long




int main()
{
	ll n,x,y;
	cin>>n>>x>>y;
	ll a[n],b[n],c[n],d[n];
	ll ans=0;
	for (int i = 0; i < n; ++i)
	{
		cin>>a[i]>>b[i]>>c[i]>>d[i];
		ans+=(d[i]);

	}
	printf("%lld\n",ans );





	return 0;
}