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#include <iostream>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0); 
    cin.tie(0);
    cout.tie(0);

    int n,k,t,maxi=-1,all=0;
    cin>>n>>k>>t;

    int g0=0,g1=t,cskip=0;
    char a[n];
    for(int i=0;i<n;i++){
        cin>>a[i];
        if(a[i]=='1'){
            cskip++;
        }
        if(a[i]!='3'){
            all++;
        }
    }
    if(cskip<=k){
        cout<<n-max(0,all-k);
        return 0;
    }
    for(int i=0;i<(t<<1);i++){
        if(a[i]=='2'){
            cskip++;
        }
    }
    int off=0;
    while(1){
        /*----print
        for(int i=0; i<n; i++){
            cout<<a[i];
        }
        cout<<"\n";
        for(int i=0;i<g0;i++){
            cout<<" ";
        }
        for(int i=0;i<t;i++){
            cout<<"#";
        }
        for(int i=g0+t;i<g1;i++){
            cout<<"-";
        }
        for(int i=0;i<t;i++){
            cout<<"#";
        }
        cout<<"\n";
        cout<<g0<<" "<<g1<<"\n";
        cout<<cskip<<" "<<off<<" "<<all<<" "<<maxi<<"\n";
        //----*/
        if(cskip>k){
            if(g0+t<g1 && (a[g0+t]=='3'||(a[g0+t]!='3'&&a[g0]=='2'))){
                if(a[g0]=='2'){
                    cskip--;
                }
                g0++;
                continue;
            }else{
                if(g1+t>=n){
                    break;
                }
                if(a[g1]!='3'){
                    cskip--;
                    off++;
                }
                if(a[g1+t]=='2'){
                    cskip++;
                }
                g1++;
            }
        }else{
            maxi=max(maxi,n-g1-t+g0-max(0,all-k-off));
            if(a[g0+t]!='3'){
                cskip++;
                off--;
            }
            if(a[g0]=='2'){
                cskip--;
            }
            g0++;
        }
    }
    cout<<maxi;
    
    return 0;
}