import java.util.Scanner;

public class Main{
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	}
} import java.util.Scanner; Scanner java.util public class Main{
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	}
} Main static long mod = 1000000007; mod 1000000007 public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt() N sc.nextInt() sc.nextInt sc M = sc.nextInt() M sc.nextInt() sc.nextInt sc C = sc.nextInt(); C sc.nextInt() sc.nextInt sc int[] B = new int[M]; B new int[M] M for(int i = 0; i < M; i++) B[i] = sc.nextInt(); int i = 0; int i = 0; i 0 i < M i M i++ i++ i B[i] = sc.nextInt(); B[i] = sc.nextInt() B[i] B i sc.nextInt() sc.nextInt sc int ans = 0; ans 0 for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		} {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		} int time = 0; time 0 for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			} int j = 0; int j = 0; j 0 j < M j M j++ j++ j {
				int A = sc.nextInt();
				time += A * B[j];
			} {
				int A = sc.nextInt();
				time += A * B[j];
			} int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc time += A * B[j] time A * B[j] A B[j] B j if(time + C > 0) ans++; time + C > 0 time + C time C 0 ans++ ans System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	}
} public class Main{
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	}
} Main
import java.util.Scanner;

public class Main{
	static long mod = 1000000007;
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(), M = sc.nextInt(), C = sc.nextInt();
		int[] B = new int[M];
		for(int i = 0; i < M; i++) B[i] = sc.nextInt();
		int ans = 0;
		for(int i = 0; i < N; i++) {
			int time = 0;
			for(int j = 0; j < M; j++) {
				int A = sc.nextInt();
				time += A * B[j];
			}
			if(time + C > 0) ans++;
		}
		System.out.println(ans);
	}
}
