import java.util.*;
public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        int C = sc.nextInt();
        int opt=0;
        ArrayList<Integer> B = new ArrayList<>();
        for(int a=0;a<M;a++) B.add(sc.nextInt());
        for(int a=0;a<N;a++){
            int num = 0;
            for(int b=0;b<M;b++){
                int num2 = sc.nextInt();
                num+=num2*B.get(b);
            }
            num+=C;
            if(num>0)opt++;
        }
        System.out.println(opt);

    }
}

/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