import java.util.*;
import java.io.*;

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 ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        }
        System.out.println(ans);

    }
} import java.util.*; util.* java import java.io.*; io.* 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];
        for (int i = 0; i < m; i++) {
            b[i] = sc.nextInt();
        }

        int ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + 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];
        for (int i = 0; i < m; i++) {
            b[i] = sc.nextInt();
        }

        int ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + 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];
        for (int i = 0; i < m; i++) {
            b[i] = sc.nextInt();
        }

        int ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + 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 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 ans = 0; ans 0 for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        } {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        } int tmp = 0; tmp 0 for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            } int j = 0; int j = 0; j 0 j < m j m j++ j++ j {
                tmp += sc.nextInt() * b[j];
            } {
                tmp += sc.nextInt() * b[j];
            } tmp += sc.nextInt() * b[j] tmp sc.nextInt() * b[j] sc.nextInt() sc.nextInt sc b[j] b j if (tmp + c > 0)
                ans++; tmp + c > 0 tmp + c tmp 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];
        for (int i = 0; i < m; i++) {
            b[i] = sc.nextInt();
        }

        int ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + 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];
        for (int i = 0; i < m; i++) {
            b[i] = sc.nextInt();
        }

        int ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        }
        System.out.println(ans);

    }
} Main
import java.util.*;
import java.io.*;

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 ans = 0;
        for (int i = 0; i < n; i++) {
            int tmp = 0;
            for (int j = 0; j < m; j++) {
                tmp += sc.nextInt() * b[j];
            }
            if (tmp + c > 0)
                ans++;
        }
        System.out.println(ans);

    }
}