#include <bits/stdc++.h>

/**
 * @title 128-bit int
 * @docs int128.md
 */
#ifdef __SIZEOF_INT128__
using uint128_t = __uint128_t;
using int128_t = __int128_t;
#else
#include <boost/multiprecision/cpp_int.hpp>
using uint128_t = boost::multiprecision::uint128_t;
using int128_t = boost::multiprecision::int128_t;
#endif


int main(){
  int64_t N, D; std::cin >> N >> D;

  std::vector<int64_t> x(N), v(N);
  for(int i = 0; i < N; ++i) std::cin >> x[i];
  for(int i = 0; i < N; ++i) std::cin >> v[i];

  auto f =
    [&](int64_t T) -> int128_t{
      int128_t ret = std::accumulate(v.begin(), v.end(), 0LL);
      ret *= T;
      return ret;
    };

  int64_t lb = 0, ub = 1e18;
  while(std::abs(lb - ub) > 1){
    auto mid = (lb + ub) / 2;
    if(f(mid) >= D){
      ub = mid;
    }else{
      lb = mid;
    }
  }

  std::cout << ub << "\n";

  return 0;
}