import java.util.Scanner;

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

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