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#include<cstdio>
#define nmax 50000
struct eu{int x,y;};
eu vcc[50001];
int v[50002],vc[50002],i,j,n,m,x,y,lin,col,lm,cm;
int main ()
{
freopen("tribute.in","r",stdin);
freopen("tribute.out","w",stdout);
scanf("%d%d%d",&n,&lin,&col);
for(i=1;i<=n;i++)
{
scanf("%d%d",&vcc[i].x,&vcc[i].y);
v[vcc[i].x]++;
vc[vcc[i].y]++;
}
for(i=1;i<=nmax;i++)
{
v[i]=v[i]+v[i-1];
vc[i]=vc[i]+vc[i-1];
}
int difmax=0,dm1=0,poz,poz1,poz2,poz3;
for(i=1;i+lin<=nmax+1;i++)
if(v[i+lin]-v[i-1]>difmax)
{
difmax=v[i+lin]-v[i-1];
poz=i;
}
for(i=1;i+col<=nmax+1;i++)
if(vc[i+col]-vc[i-1]>dm1)
{
dm1=vc[i+col]-vc[i-1];
poz1=i;
}
int s=0;
poz2=poz+lin;
poz3=poz1+col;
for(i=1;i<=n;i++)
{
if(vcc[i].x<=poz)
s+=poz-vcc[i].x;
if(vcc[i].x>=poz2)
s+=vcc[i].x-poz2;
if(vcc[i].y<=poz1)
s+=poz1-vcc[i].y;
if(vcc[i].y>=poz3)
s+=(-poz3+vcc[i].y);
}
printf("%d",s);
return 0;
}