Baekjoon #13422

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

public class Main {
    public static void main(String[] args) {
        FastReader rd = new FastReader();
        int T = rd.nextInt();

        StringBuffer sb = new StringBuffer();
        while (--T >= 0) {
            int N = rd.nextInt();
            int M = rd.nextInt();
            int K = rd.nextInt();

            int a[] = new int[N + M];

            for (int i = 1; i <= N; i++) {
                a[i] = a[i - 1] + rd.nextInt();
            }

            if (N == M) {
                sb.append(a[N] < K ? 1 : 0).append("\n");
                continue;
            }

            int idx = N + 1;
            for (int i = 1; i < M; i++) {
                a[idx] = a[idx - 1] + a[i] - a[i - 1];
                idx++;
            }

            int ret = 0;
            for (int i = 0; i < N; i++) {
                if (a[i + M] - a[i] < K) ret++;
            }
            sb.append(ret).append("\n");
        }
        System.out.print(sb.toString());
    }

    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }
}