import java.util.*;
import java.math.RoundingMode;
import java.math.BigDecimal;
 
 
 
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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 }
} import java.util.*; util.* java import java.math.RoundingMode; RoundingMode java.math import java.math.BigDecimal; BigDecimal java.math 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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 }
} 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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 } main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int c = sc.nextInt();
		int b[] = new int[m];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 } 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 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 int a[][] = new int[n][m]; a new int[n][m] n m 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 ans = 0; ans 0 for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		} {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		} int val = 0; val 0 for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			} int j = 0; int j = 0; j 0 j < m j m j++ j++ j {
				val += a[i][j]*b[j];	
			} {
				val += a[i][j]*b[j];	
			} val += a[i][j]*b[j] val a[i][j]*b[j] a[i][j] a[i] a i j b[j] b j if (val+c>0) ans++;
			else continue; val+c>0 val+c val c 0 ans++ ans continue; System.out.println(ans) System.out.println System.out System System.out ans 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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 }
} 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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 }
} Main
import java.util.*;
import java.math.RoundingMode;
import java.math.BigDecimal;
 
 
 
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];
		for(int i = 0; i < m; i++) {
			b[i] = sc.nextInt();
		}
		int a[][] = new int[n][m];
		for(int i = 0; i < n; i++) {
			for(int j = 0; j < m; j++) {
				a[i][j] = sc.nextInt();
			}
		}
		int ans = 0;
		for(int i = 0; i < n; i++) {
			int val = 0;
			for(int j = 0; j < m; j++) {
				val += a[i][j]*b[j];	
			}
			if (val+c>0) ans++;
			else continue;
		}
		System.out.println(ans);
	 }
}