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[] B = new int[M];
      for(int x=0;x<M;x++){
    	  B[x] = sc.nextInt();
      }
      int[] A = new int[M];
      int total;
      int count = 0;
      for(int y=0;y<N;y++){
    	total = 0;
    	for(int z=0;z<M;z++){
    		A[z] = sc.nextInt();
    		total = total + A[z]*B[z];
    	}
    	total = total + C;
    	if(0<total){
    		count++;
    	}
      }
      System.out.println(count);
    }
}
/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