11559

#include<stdio.h>
#include<iostream>
using namespace std;
int main()
{
	int n,b,h,w,price;
	int seat;

	while(scanf("%d %d %d %d",&n,&b,&h,&w)==4)
	{
		int ans=0;

		for(int j=0;j<h;j++)
		{

			scanf("%d",&price);

		for(int i=0;i<w;i++)
		{
			scanf("%d",&seat);
			if(seat>=n)
			{
				if(ans==0)
				ans=price*n;
				else if(ans>(price*n))
				ans=price*n;


			}

		}

		}

	if(ans<b)
	printf("%d\n",ans);
	else
	printf("stay home\n");
	}
return 0;

}