#ifdef __LOCAL
#define _GLIBCXX_DEBUG
#endif
#include <bits/stdc++.h>

#include <atcoder/all>
using namespace std;
using namespace atcoder;

typedef unsigned long long ull;
typedef long long ll;

const double PI = 3.14159265358979323846;

#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)

// aよりもbが大きいならばaをbで更新する
// (更新されたならばtrueを返す)
template <typename T>
bool chmax(T& a, const T& b) {
  if (a < b) {
    a = b;  // aをbで更新
    return true;
  }
  return false;
}

// aよりもbが小さいならばaをbで更新する
// (更新されたならばtrueを返す)
template <typename T>
bool chmin(T& a, const T& b) {
  if (a > b) {
    a = b;  // aをbで更新
    return true;
  }
  return false;
}

// a^p
// 2^3 = 2 * 2^2
// 2^2 = 2 * (2^1)
// 2^1 = 2
ll powpow(ll a, ll p) {
  if (p == 0) return 1;

  if (p % 2 == 0) {
    ll half = powpow(a, p / 2);
    return half * half;
  } else {
    return a * powpow(a, p - 1);
  }
}

class combination {
 private:
  ll N;
  vector<vector<ll>> C;

 public:
  explicit combination(ll _n) : N(_n) {
    C.resize(N + 1);
    rep(i, N + 1) C[i].resize(N + 1);
    C[0][0] = 1;
    rep(i, N) rep(j, i + 1) {
      C[i + 1][j + 1] += C[i][j];
      C[i + 1][j] += C[i][j];
    }
  }

  ll operator()(ll n, ll k) {
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return C[n][k];
  }
};

// ref. https://drken1215.hatenablog.com/entry/2018/06/08/210000
class modcombination {
 private:
  ll mod;
  vector<ll> fac, finv, inv;

 public:
  modcombination(ll n, ll _mod) : mod(_mod) {
    fac.resize(n + 1);
    finv.resize(n + 1);
    inv.resize(n + 1);

    fac[0] = fac[1] = 1;
    finv[0] = finv[1] = 1;
    inv[1] = 1;

    for (ll i = 2; i <= n; i++) {
      fac[i] = fac[i - 1] * i % mod;
      inv[i] = mod - inv[mod % i] * (mod / i) % mod;
      finv[i] = finv[i - 1] * inv[i] % mod;
    }
  }

  ll operator()(ll n, ll k) {
    if (n < k) return 0;
    if (n < 0 || k < 0) return 0;
    return fac[n] * (finv[k] * finv[n - k] % mod) % mod;
  }
};

// cf. https://qiita.com/drken/items/a14e9af0ca2d857dad23
vector<ll> enum_divisors(ll n) {
  vector<ll> res;
  // sqrt(n)まで試し割り
  for (ll i = 1; i * i <= n; i++) {
    if (n % i == 0) {
      res.push_back(i);
      // 重複しないならばiの相方であるn/iも約数
      // e.g. n=25のときのi=5は重複
      if (n / i != i) res.push_back(n / i);
    }
  }

  sort(res.begin(), res.end());
  return res;
}

// cf. https://qiita.com/drken/items/a14e9af0ca2d857dad23
map<ll, ll> prime_factors(ll n) {
  map<ll, ll> res;
  // sqrt(n)まで試し割り
  for (ll a = 2; a * a <= n; a++) {
    if (n % a != 0) continue;

    // nで割れる限り割る
    while (n % a == 0) {
      res[a]++;
      n /= a;
    }
  }
  if (n != 1) res[n]++;

  return res;
}

// p/q
struct fraction {
  ll p, q;
  fraction(ll _p = 0, ll _q = 1) : p(_p), q(_q) {
    if (q == 0) {
      p = 1;
      return;
    }
    if (q < 0) {
      p = -p;
      q = -q;
    }

    ll g = gcd(p, q);
    p /= g;
    q /= g;
  }

  bool operator<(const fraction& other) const {
    return p * other.q < q * other.p;
  }

  bool operator<=(const fraction& other) const {
    return p * other.q <= q * other.p;
  }

  bool operator==(const fraction& other) const {
    return p == other.p && q == other.q;
  }
};

// res[i][c] := i 文字目以降で最初に文字 c が登場する index (存在しないときは n)
vector<vector<ll>> calcNext(const string& S) {
  ll n = (ll)S.size();
  vector<vector<ll>> res(n + 1, vector<ll>(26, n));
  for (ll i = n - 1; i >= 0; --i) {
    for (ll j = 0; j < 26; ++j) res[i][j] = res[i + 1][j];
    res[i][S[i] - 'a'] = i;
  }
  return res;
}

// ref. https://algo-logic.info/bridge-lowlink/
struct LowLink {
  vector<vector<ll>> G;
  vector<ll> ord, low;
  vector<bool> visited;
  vector<pair<ll, ll>> bridges;

  explicit LowLink(const vector<vector<ll>>& _G) : G(_G) {
    visited.resize(G.size(), false);
    ord.resize(G.size(), 0);
    low.resize(G.size(), 0);
    ll k = 0;
    rep(i, (ll)G.size()) {
      if (visited[i]) continue;
      k = dfs(i, k);
    }
  }

  ll dfs(ll node, ll k, ll parent = -1) {
    visited[node] = true;
    ord[node] = k;
    low[node] = k;
    k++;
    for (auto g : G[node]) {
      if (!visited[g]) {
        k = dfs(g, k, node);
        low[node] = min(low[node], low[g]);
        if (ord[node] < low[g]) {
          bridges.emplace_back(node, g);
        }
      } else if (g != parent) {
        low[node] = min(low[node], ord[g]);
      }
    }

    return k;
  }
};

// 3x3(アフィン変換)
struct matrix {
  vector<vector<ll>> a;
  matrix(const vector<vector<ll>>& _a = {{1, 0, 0}, {0, 1, 0}, {0, 0, 1}})
      : a(_a) {}
  matrix operator*(const matrix& x) {
    matrix res({{0, 0, 0}, {0, 0, 0}, {0, 0, 0}});
    rep(i, 3) rep(j, 3) rep(k, 3) {
      // cout << i << "," << j << " <- " << a[i][k] << "*" << x.a[k][j] << endl;
      res.a[i][j] += a[i][k] * x.a[k][j];
    }

    return res;
  }

  vector<ll> operator*(const vector<ll>& x) {
    matrix other({{x[0], 0, 0}, {x[1], 0, 0}, {1, 0, 0}});
    auto res = *this * other;
    return vector<ll>({res.a[0][0], res.a[1][0], res.a[2][0]});
  }
};

int main() {
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << fixed << setprecision(15);

  ll n, k;
  cin >> n >> k;
  k--;
  vector<ll> x(n), a(n);
  rep(i, n) cin >> x[i];
  rep(i, n) cin >> a[i];

  ll left = x[k] - a[k];
  ll right = x[k] + a[k];
  ll l = k;
  ll r = k;
  bool update = true;
  while (update) {
    update = false;
    // cout << l << " " << r << endl;
    // cout << left << " " << right << endl;
    while (r + 1 < n && x[r + 1] <= right) {
      r++;
      chmin(left, x[r] - a[r]);
      chmin(right, x[r] + a[r]);
      update = true;
    }
    while (l - 1 >= 0 && x[l - 1] >= left) {
      l--;
      chmin(left, x[l] - a[l]);
      chmax(right, x[l] + a[l]);
      update = true;
    }
  }
  cout << r - l + 1 << endl;

  return 0;
}