#include <algorithm>
#include <cassert>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
const int INF = (1 << 30);
const ll INFL = (1LL << 62);
const ll MOD = 1000000007;
template <class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T>
T gcd(T a, T b) {
    return b ? gcd(b, a % b) : a;
}
template <class T>
T lcm(T a, T b) {
    return a / gcd(a, b) * b;
}
template <class T>
ll mod_pow(ll a, ll n, T mod) {
    mod = (ll)mod;
    ll res = 1, p = a % mod;
    while (n) {
        if (n & 1) res = res * p % mod;
        p = p * p % mod;
        n >>= 1;
    }
    return res;
}
template <int mod>
struct ModInt {
    using ll = long long;
    ll x;
    ModInt() : x(0) {}
    ModInt(int y) : x(y >= 0 ? ll(y % mod) : (ll)((mod - (-y) % mod))) {}
    ModInt(ll y) : x(y >= 0 ? y % mod : (mod - (-y) % mod)) {}
    ModInt &operator+=(const ModInt &rhs) {
        if ((x += rhs.x) >= mod) x -= mod;
        return *this;
    }
    ModInt &operator-=(const ModInt &rhs) {
        if ((x += mod - rhs.x) >= mod) x -= mod;
        return *this;
    }
    ModInt &operator*=(const ModInt &rhs) {
        x = x * rhs.x % mod;
        return *this;
    }
    ModInt &operator/=(const ModInt &rhs) {
        *this *= rhs.inverse();
        return *this;
    }
    ModInt operator-() const { return ModInt(-x); }
    ModInt operator+(const ModInt &rhs) const { return ModInt(*this) += rhs; }
    ModInt operator-(const ModInt &rhs) const { return ModInt(*this) -= rhs; }
    ModInt operator*(const ModInt &rhs) const { return ModInt(*this) *= rhs; }
    ModInt operator/(const ModInt &rhs) const { return ModInt(*this) /= rhs; }
    ModInt operator==(const ModInt &rhs) const { return x == rhs.x; }
    ModInt operator!=(const ModInt &rhs) const { return x != rhs.x; }
    friend ostream &operator<<(ostream &os, const ModInt &rhs) {
        return os << rhs.x;
    }
    friend istream &operator>>(istream &is, ModInt &rhs) {
        ll t;
        is >> t;
        rhs = ModInt<mod>(t);
        return (is);
    }

   private:
    ModInt inverse() const {
        ll a = x, u = 1LL, v = 0LL, t, b = (ll)mod;
        while (b > 0) {
            t = a / b;
            swap(a -= t * b, b);
            swap(u -= t * v, v);
        }
        return ModInt(u);
    }
};
using mint = ModInt<MOD>;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N, K;
    cin >> N >> K;
    string s;
    cin >> s;
    vector<int> nums;
    if (s[0] == '0') nums.push_back(0);
    int s_len = s.size();
    for (int i = 0; i < s_len;) {
        int j = i;
        while (j < s_len && s[j] == s[i]) ++j;
        nums.push_back(j - i);
        i = j;
    }
    if (s.back() == '0') nums.push_back(0);
    int nums_len = nums.size();
    vector<int> sums(nums_len + 1, 0);
    rep(i, nums_len) sums[i + 1] = sums[i] + nums[i];

    int res = 0;
    int sums_len = sums.size();
    for (int left = 0; left < sums_len; left += 2) {
        int right = left + 2 * K + 1;
        if (right >= sums_len) right = sums_len - 1;
        res = max(res, sums[right] - sums[left]);
    }

    cout << res << endl;
    return 0;
}

Measured memory_bytes: 1272