import java.util.*;
import java.lang.*;
import java.io.*;

class Main {
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        st= new StringTokenizer(br.readLine());

        int N = Integer.parseInt(st.nextToken());
        int S = Integer.parseInt(st.nextToken());
        long L = Long.parseLong(st.nextToken());
        
        int[] dist = new int[N]; 

        st= new StringTokenizer(br.readLine());
        for (int i=1; i<N; i++) {
            dist[i] = Integer.parseInt(st.nextToken());
        }

        int[] acc_dist = new int[N+1];
        
        for (int i=1; i<=N; i++) {
            if(S-i>=1) {
                acc_dist[S-i] = acc_dist[S-i+1] + dist[S-i];
            }
            if(S+i<=N) {
                acc_dist[S+i] = acc_dist[S-1+i] + dist[S-1+i];
            }
        }


        int max_visite = 0;
        for (int l=1; l<=N; l++) {
            for (int r = l; r <= N; r++) {
                int dist1 = acc_dist[S] - acc_dist[l];
                int dist2 = acc_dist[r] - acc_dist[S];
                int d = Math.min(dist1 + dist2*2, dist1*2+dist2);
                if(L>=d) {
                    max_visite = Math.max(max_visite , r-l+1);
                }
            }
        }
        System.out.println(max_visite);

        

        
        
    }
}