import java.util.Scanner;

// 5
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];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        System.out.println(ans);
    }

} 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[] B = new int[M];
        int[][] A = new int[N][M];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        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];
        int[][] A = new int[N][M];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        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];
        int[][] A = new int[N][M];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        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 int[][] A = new int[N][M]; A new int[N][M] N 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] 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(); 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] A[i] A i j sc.nextInt() sc.nextInt sc int ans = 0; ans 0 for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        } {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        } int ans_pat = 0; ans_pat 0 for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j]; int j = 0; int j = 0; j 0 j < M j M j++ j++ j ans_pat += A[i][j] * B[j]; ans_pat += A[i][j] * B[j] ans_pat A[i][j] * B[j] A[i][j] A[i] A i j B[j] B j if(ans_pat + C > 0) ++ans; ans_pat + C > 0 ans_pat + C ans_pat C 0 ++ans ans 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];
        int[][] A = new int[N][M];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        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];
        int[][] A = new int[N][M];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        System.out.println(ans);
    }

} Main
import java.util.Scanner;

// 5
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];
        
        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();

        int ans = 0;
        for(int i = 0; i < N; i++) {
            int ans_pat = 0;
            for(int j = 0; j < M; j++)
                ans_pat += A[i][j] * B[j];

            if(ans_pat + C > 0) ++ans;
        }

        System.out.println(ans);
    }

}
