This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define mkp make_pair
#define PH push
#define PB push_back
#define REP(i,N) for( int i = 0; i < (N); ++i )
#define FOR(i,a,b) for( int i = (a); i <= (b); ++i )
#define ALL(x) begin(x), end(x)
#define MEM(x) memset(x, 0, sizeof(x))
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<typename T>
using V=vector<T>;
void solve() {
int N, M; cin >> N >> M;
V<pll> vc(N);
for( auto &i : vc ) cin >> i.F;
for( auto &i : vc ) cin >> i.S;
ll total = 1LL*N*M;
auto check = [&]( ll val ) {
ll sum = 0;
for( auto &i : vc ){
sum += (val+i.S-1)/i.S;
}
return sum;
};
ll l = 0, r = 1e18+3000;
while( r-l > 1 ) {
ll m = (l+r)>>1;
if( check(m)<=total )
l=m;
else
r=m;
}
cout << l << '\n';
}
int main() {
int T = 1;
#ifdef LOCAL
freopen( "input.txt", "r", stdin);
freopen( "output.txt", "w", stdout );
cin >> T;
#else
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif
while(T--) solve();
}
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