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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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] b i sc.nextInt() sc.nextInt sc for (int i = 0; i < n; ++i) {
      int sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : res;
    } int i = 0; int i = 0; i 0 i < n i n ++i ++i i {
      int sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : res;
    } {
      int sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : res;
    } int sum = c; sum c for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt(); int j = 0; int j = 0; j 0 j < m j m ++j ++j j sum += b[j] * sc.nextInt(); sum += b[j] * sc.nextInt() sum b[j] * sc.nextInt() b[j] b j sc.nextInt() sc.nextInt sc res = (sum > 0) ? res + 1 : res res (sum > 0) ? res + 1 : res (sum > 0) sum 0 res + 1 res 1 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : 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 sum = c;
      for (int j = 0; j < m; ++j)
        sum += b[j] * sc.nextInt();
      res = (sum > 0) ? res + 1 : res;
    }

    System.out.println(res);
  }
}
