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[][] A = new int[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	}

} 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[][] A = new int[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	}

} 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[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int M = sc.nextInt();
		int C = sc.nextInt();
		int[][] A = new int[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	} 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[N][M]; A new int[N][M] N M int[] B = new int[M]; B new int[M] M int a = 0; a 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();
			}
		} 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 sc.close() sc.close sc for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		} int i=0; int i=0; i 0 i<N i N i++ i++ i {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		} {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		} int s = 0; s 0 for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			} int j=0; int j=0; j 0 j<M j M j++ j++ j {
				s += A[i][j] * B[j];
			} {
				s += A[i][j] * B[j];
			} s += A[i][j] * B[j] s A[i][j] * B[j] A[i][j] A[i] A i j B[j] B j s += C s C if(s>0) {
				a++;
			} s>0 s 0 {
				a++;
			} a++ a System.out.println(a) System.out.println System.out System System.out a 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[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	}

} 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[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	}

} 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[][] A = new int[N][M];
		int[] B = new int[M];
		int a = 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();
			}
		}
		sc.close();
		for(int i=0; i<N; i++) {
			int s = 0;
			for(int j=0; j<M; j++) {
				s += A[i][j] * B[j];
			}
			s += C;
			if(s>0) {
				a++;
			}
		}
		System.out.println(a);
	}

}