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#include <bits/stdc++.h>
#define all(vec) vec.begin(),vec.end()
#define CLR(i,a) memset(i,a,sizeof(i))
#define fi first
#define se second
#define pb push_back
#define SZ(a) ((int) a.size())
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define ROF(i, a, b) for (int i = (a); i >= (b); --i)
#define getFro(vec) (vec.empty()?0:vec.front())
#define getBac(vec) (vec.empty()?0:vec.front())
#define debug(var) cerr << #var <<":"<<var<<"\n";
#define DEBUG(variable) \
do { \
std::cerr << #variable << ":"; \
for (const auto& elem : variable) { \
std::cerr << elem << " "; \
} \
std::cerr << "\n"; \
} while (0)
#define uniVec(var) \
do { \
sort(var.begin(),var.end());\
var.resize(unique(var.begin(),var.end())-var.begin());\
} while (0)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef __int128 i128;
typedef pair<ll,ll> pll;
typedef array<ll,2> arr;
typedef double DB;
typedef pair<DB,DB> pdd;
typedef pair<ll,bool> plb;
constexpr ll MAXN=static_cast<ll>(1e6)+10,INF=static_cast<ll>(1e18)+3;
constexpr ll mod=static_cast<ll>(1e9)+7;
constexpr double eps=1e-8;
ll N,M,K,T;
ll ans=0;
arr ab[MAXN];
ll diff[MAXN],Sum[MAXN];
inline void solve(){
cin>>N>>K;
vector<ll> li,Vals,B;
FOR(i,0,3*N+5){
Sum[i]=0;
diff[i]=0;
}
FOR(i,1,N){
cin>>ab[i][0];
li.pb(ab[i][0]+1);
li.pb(ab[i][0]);
Vals.pb(ab[i][0]);
}
FOR(i,1,N){
cin>>ab[i][1];
li.pb(ab[i][1]);
Vals.pb(ab[i][1]);
B.pb(ab[i][1]);
}
sort(all(B));
uniVec(li);
uniVec(Vals);
li.pb(li.back()+1);
FOR(i,1,N){
ll beg=lower_bound(all(li),ab[i][0]+1)-li.begin(),
ed=lower_bound(all(li),ab[i][1])-li.begin();
diff[beg]+=1;
diff[ed+1]-=1;
}
Sum[0]=diff[0];
FOR(i,1,3*N){
Sum[i]=Sum[i-1]+diff[i];
}
#ifdef LOCAL
cerr<<"Sum:";
FOR(i,0,2*N){
cerr<<Sum[i]<<" ";
}
cerr<<"\n";
DEBUG(li);
DEBUG(B);
#endif
ans=0;
FOR(i,0,SZ(Vals)-1){
ll val=Vals[i];
ll idx=lower_bound(all(li),val)-li.begin();
#ifdef LOCAL
if(val==1){
debug(Sum[idx]);
debug(K);
}
#endif
if(Sum[idx]<=K){
ll ind=lower_bound(all(B),val)-B.begin();
ll num=N-ind;
ans=max(num*val,ans);
#ifdef LOCAL
debug(ind);
#endif
}
}
cout<<ans<<"\n";
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
cin>>T;
while(T--){
solve();
}
return 0;
}
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