#include <bits/stdc++.h>
using namespace std;
int main()
{
int p,b,h,w,price,i,a,j,s;
while(scanf("%d %d %d %d",&p,&b,&h,&w)==4)
{
int cost=15000000;
for(i=0;i<h;i++)
{
scanf("%d",&price);
for(j=0;j<w;j++)
{
scanf("%d",&a);
s=0;
if(a>=p)
{
s=price*p;
if(cost>s)
cost=s;
}
}
}
if(cost<=b)
cout<<cost<<endl;
else
cout<<"stay home"<<endl;
}
return 0;
}
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