import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
Scanner sc1=new Scanner(System.in);
int temp=0;
long suma;
byte N=sc1.nextByte();
byte M=sc1.nextByte();
byte C=sc1.nextByte();
byte arr[]=new byte[M];
for(byte i=0;i<M;i++){arr[i]=sc1.nextByte();}
byte matriz[][]=new byte[N][M];
for(byte i=0;i<N;i++){
for(byte j=0;j<M;j++){matriz[i][j]=sc1.nextByte();}
}
for(byte i=0;i<N;i++){suma=C;
for(byte j=0;j<M;j++){suma+=(matriz[i][j]*arr[j]);}
if(suma>0){temp++;}
}
        System.out.println(temp);
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz