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#include <bits/stdc++.h>
using namespace std;
#define fwd(i, a, n) for (int i = (a); i < (n); i++)
#define rep(i, n) fwd(i, 0, n)
#define all(X) X.begin(), X.end()
#define sz(X) int(size(X))
#define pb push_back
#define eb emplace_back
#define st first
#define nd second
using pii = pair<int, int>; using vi = vector<int>;
using ll = long long; using ld = long double;
#ifdef LOC
auto SS = signal(6, [](int) { *(int *)0 = 0; });
#define DTP(x, y) auto operator<<(auto &o, auto a) -> decltype(y, o) { o << "("; x; return o << ")"; }
auto operator<<(auto &o, auto a) -> decltype(all(a), o);
DTP(o << a.st << ", " << a.nd, a.nd);
DTP(for (auto i : a) o << i << ", ", all(a));
#define deb(x...) cerr << setw(4) << __LINE__ << ":[" #x "]: ", [](auto... arg_) { (( cerr << arg_ << ", " ), ...) << '\n'; }(x)
#else
#define deb(...) 0
#endif

void solve() {
    int n, k, t; string sched;
    cin >> n >> k >> t >> sched;

    vi pOffice(n+1), pRemote(n+1), pFree(n+1), pMeet(n+1);
    rep(i, n) {
        pOffice[i+1] = pOffice[i] + (sched[i] == '1');
        pRemote[i+1] = pRemote[i] + (sched[i] == '2');
        pFree[i+1] = pFree[i] + (sched[i] == '3');
        pMeet[i+1] = pOffice[i+1] + pRemote[i+1];
    }

    int ans = -1;
    if (pOffice[n] <= k) {
        ans = pFree[n] + min(k, pMeet[n]);
    }

    fwd(toWork, 1, n + 1) fwd(toHome, toWork + t, n + 2 - t) {
        int skip1 = pMeet[toWork + (t-1)] - pMeet[toWork - 1];
        int skip2 = pMeet[toHome + (t-1)] - pMeet[toHome - 1];
        int skipO = pOffice[toWork - 1] + pOffice[n] - pOffice[toHome + (t-1)];
        int skipLeft = k - (skip1 + skip2 + skipO);
        if (skipLeft < 0) continue;

        int freeHome = pFree[toWork - 1] + pFree[n] - pFree[toHome + (t-1)];
        int officeHome = pOffice[toWork - 1] + pOffice[n] - pOffice[toHome + (t-1)];
        int remoteHome = pRemote[toWork - 1] + pRemote[n] - pRemote[toHome + (t-1)];

        int here = freeHome + officeHome + min(remoteHome, skipLeft);
        ans = max(ans, here);
    }

    cout << ans << '\n';
}

int32_t main() {
    cin.tie(0)->sync_with_stdio(0);
    cout << fixed << setprecision(10);

    int z = 1;
    // cin >> z;
    rep(_, z) solve();

    cout << flush;
    _Exit(0);
}