import java.util.Scanner;
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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	}
}

 import java.util.Scanner; Scanner 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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	}
} 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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int c = sc.nextInt();
		int res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int m = sc.nextInt(); m sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int res = 0; res 0 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] = sc.nextInt() b[i] b i sc.nextInt() sc.nextInt sc for(int i = 0; i < n; i++){
			int tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			int tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		} {
			int tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		} int tmp = c; tmp c for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			} int j = 0; int j = 0; j 0 j < m j m j++ j++ j {
				tmp += sc.nextInt() * b[j];
			} {
				tmp += sc.nextInt() * b[j];
			} tmp += sc.nextInt() * b[j] tmp sc.nextInt() * b[j] sc.nextInt() sc.nextInt sc b[j] b j if(tmp > 0){
				res ++;
			} tmp > 0 tmp 0 {
				res ++;
			} res ++ res System.out.println(res) System.out.println System.out System System.out res String[] args args 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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	}
} 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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	}
} Main
import java.util.Scanner;
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 res = 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 tmp = c;
			for (int j = 0; j < m; j++){
				tmp += sc.nextInt() * b[j];
			}
			if(tmp > 0){
				res ++;
			}
		}
		System.out.println(res);
 	}
}


