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