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