import java.util.*;
import java.io.*;
import static java.lang.System.in;

public class Main {
    static int n,m,C;
    static int[] B;
    static HashSet<Integer>[] graph;
    public static void main(String[] args)throws IOException {
        //BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        Scanner sc = new Scanner(System.in);
        n = sc.nextInt(); m = sc.nextInt(); C = sc.nextInt();
        B = new int[m];
        for(int i=0;i<m;i++) B[i]=sc.nextInt();
        int[] a = new int[m];
        int ans = 0;
        for(int i=0;i<n;i++){
            for(int j=0;j<m;j++) a[j] = sc.nextInt();
            if(check(a)) ans++;
        }
        System.out.println(ans);
    }
    static boolean check(int[] a){
        int res = C;
        for(int j=0;j<m;j++) res += a[j]*B[j];
        return res>0;
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz