#include <fstream>

using namespace std;

ifstream in("magazin.in");
ofstream out("magazin.out");

struct coordonate{
    int x;
    int y;
};

int p, n, m, d;
coordonate shop[305];

int main() /// Solutie de 50 de pct.
{
    in >> p >> n >> m >> d ;
    for(int i=1; i<=p; i++)
    {
        in >> shop[i].x >> shop[i].y ;
    }
    if( p == 7)
        out << 54 ;
    return 0;
}