import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    }

    static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    }

    static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) B solver = new B(); solver new B() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    } B public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        } solve {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        } int n = Integer.parseInt(in.next()); n Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int m = Integer.parseInt(in.next()); m Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int c = Integer.parseInt(in.next()); c Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int b[] = new int[m]; b new int[m] m for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            } int i = 0; int i = 0; i 0 i < m i m i++ i++ i {
                b[i] = Integer.parseInt(in.next());
            } {
                b[i] = Integer.parseInt(in.next());
            } b[i] = Integer.parseInt(in.next()) b[i] b i Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in 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] = Integer.parseInt(in.next());
                }
            } 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] = Integer.parseInt(in.next());
                }
            } {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            } for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                } int j = 0; int j = 0; j 0 j < m j m j++ j++ j {
                    a[i][j] = Integer.parseInt(in.next());
                } {
                    a[i][j] = Integer.parseInt(in.next());
                } a[i][j] = Integer.parseInt(in.next()) a[i][j] a[i] a i j Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int ans = 0; ans 0 for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            } {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            } int ac = 0; ac 0 for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                } int j = 0; int j = 0; j 0 j < m j m j++ j++ j {
                    ac += a[i][j] * b[j];
                } {
                    ac += a[i][j] * b[j];
                } ac += a[i][j] * b[j] ac a[i][j] * b[j] a[i][j] a[i] a i j b[j] b j if (ac + c > 0) ans++; ac + c > 0 ac + c ac c 0 ans++ ans out.println(ans) out.println out ans int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    }

    static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    }

    static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        B solver = new B();
        solver.solve(1, in, out);
        out.close();
    }

    static class B {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            // 入力
            int n = Integer.parseInt(in.next());
            int m = Integer.parseInt(in.next());
            int c = Integer.parseInt(in.next());
            int b[] = new int[m];
            for (int i = 0; i < m; i++) {
                b[i] = Integer.parseInt(in.next());
            }
            int a[][] = new int[n][m];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < m; j++) {
                    a[i][j] = Integer.parseInt(in.next());
                }
            }
            int ans = 0;

            for (int i = 0; i < n; i++) {
                int ac = 0;
                for (int j = 0; j < m; j++) {
                    ac += a[i][j] * b[j];
                }
                if (ac + c > 0) ans++;
            }

            // 出力
            out.println(ans);

        }

    }
}

