#include <fstream>
#include <algorithm> 
using namespace std;
ifstream fi("tribute.in");
ofstream fo("tribute.out");
int A[50001],B[50001];
int n,a,b,i,rez;
int main() 
{
    fi>>n>>a>>b;
    for(i= 1; i<=n; i++) 
        fi>>A[i]>>B[i];
    sort(A+1,A+n+1);
    sort(B+1,B+n+1);
    rez=0;
    for(i=1; i<=n; i++) 
	{
        if(A[n-i+1]-A[i]-a>0)
            rez=rez+A[n-i+1]-A[i]-a;
        if(B[n-i+1]-B[i]-b>0)
            rez=rez+B[n-i+1]-B[i]-b;
    }
    fo<<rez<<"\n";
	fi.close();
	fo.close();
    return 0;
}