import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt(),
            M = sc.nextInt(),
            C = sc.nextInt(),
            correct = 0;
        int[] B = new int[M];
        for(int i = 0; i < M; i++){
            B[i] = sc.nextInt();
        }
        for(int i = 0; i < N; i++){
            int value = C;
            for(int j = 0; j < M; j++){
                value += sc.nextInt()*B[j];
            }
            if(value > 0){
                correct++;
            }
        }
        System.out.println(correct);
    }
}
/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