import java.util.*;

class Main {
    public static void main(String[] args) {
        new Solver().run();
    }
}

class Solver {

    public void run() {
        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 cnt = 0;
        for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        }

        System.out.println(cnt);

        return;
    }

} import java.util.*; util.* java class Main {
    public static void main(String[] args) {
        new Solver().run();
    }
} Main public static void main(String[] args) {
        new Solver().run();
    } main {
        new Solver().run();
    } new Solver().run() new Solver().run new Solver() String[] args args class Solver {

    public void run() {
        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 cnt = 0;
        for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        }

        System.out.println(cnt);

        return;
    }

} Solver public void run() {
        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 cnt = 0;
        for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        }

        System.out.println(cnt);

        return;
    } run {
        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 cnt = 0;
        for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        }

        System.out.println(cnt);

        return;
    } 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 cnt = 0; cnt 0 for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        } {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        } long sum = C; sum C for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            } int j = 0; int j = 0; j 0 j < M j M j++ j++ j {
                sum += A[i][j] * B[j];
            } {
                sum += A[i][j] * B[j];
            } sum += A[i][j] * B[j] sum A[i][j] * B[j] A[i][j] A[i] A i j B[j] B j if (sum > 0) cnt++; sum > 0 sum 0 cnt++ cnt System.out.println(cnt) System.out.println System.out System System.out cnt return;
import java.util.*;

class Main {
    public static void main(String[] args) {
        new Solver().run();
    }
}

class Solver {

    public void run() {
        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 cnt = 0;
        for (int i = 0; i < N; i++) {
            long sum = C;
            for (int j = 0; j < M; j++) {
                sum += A[i][j] * B[j];
            }
            if (sum > 0) cnt++;
        }

        System.out.println(cnt);

        return;
    }

}