import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int num = sc.nextInt();
		int numInt = sc.nextInt();
		int c = sc.nextInt();
		long get[] = new long[numInt];
		for(int i = 0; i < numInt; i ++) {
			get[i] = sc.nextLong();
		}
		long code[][] = new long[num][numInt];
		for(int i = 0; i < num; i ++) {
			for(int j = 0; j < numInt; j ++) {
				code[i][j] = sc.nextLong();
			}
		}
		int count = 0;
		for(int i = 0; i < num; i ++) {
			int tmp = c;
			for(int j = 0; j < numInt; j ++) {
				tmp += code[i][j] * get[j];
			}
			if(tmp > 0) { 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