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#include <bits/stdc++.h>

using namespace std;

int main() {
    // Dane
    long long n,k,t;
    string day;
    cin >> n >> k >> t >> day;
    // Robocze
    vector<int> meet_stat;
    vector<int> pref_mstat;
    vector<int> meet_zdal;
    vector<int> pref_mzdal;
    pref_mstat.resize(n);
    pref_mzdal.resize(n);
    uint64_t res=0;
    for (int i=0; i<day.size(); i++) {
        switch(day[i]) {
            case '1': {
                meet_stat.push_back(i);
                if (i==0) pref_mstat[i]++;
                else pref_mstat[i] = pref_mstat[i-1] + 1;
                break;
            }
            case '2': {
                meet_zdal.push_back(i);
                if (i==0) pref_mzdal[i]++;
                else pref_mzdal[i] = pref_mzdal[i-1] + 1;
                break;
            }
            default: {
                pref_mstat[i] = pref_mstat[i-1];
                pref_mzdal[i] = pref_mzdal[i-1];
            }
        }
    }
    if (meet_stat.size() <= k) {
        k = meet_stat.size() + meet_zdal.size() - k + 1;
        if (k < 0) k=0;
        cout << n - k << '\n';
    } 
    return 0;
}