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#include<bits/stdc++.h>

int main()
{
int n,k,x,year=INT_MAX;
scanf("%d%d",&n,&k);

for(int j=0;j<n;++j)
  for(int i=0;i<=j;++i)
  {
    scanf("%d",&x);
    if((x<year)&&((i+1)*(j-i+1)<=k)) year=x;
  }
printf("%d",year);
return 0;
}