#include "bits/stdc++.h"
using namespace std;
#define int long long
//#define endl '\n'
int mod=1e9+7;
int mod2=998244353;
const int INF=1e9;

signed main(){
  int n,m,k;
  cin>>n>>m>>k;
  vector<int> b(m);
  for(int i=0;i<m;i++)cin>>b[i];
  int ans=0;
  for(int i=0;i<n;i++){
    int tmp=k;
    for(int j=0;j<m;j++){
      int a;
      cin>>a;
      tmp+=a*b[j];
    }
    if(tmp>0)ans++;
  }
  cout<<ans<<endl;
}

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