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#include<bits/stdc++.h>
using namespace std;

int n,m,c;
int a[50][50];
int cnt;
int b[50];

int main(){

    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>m>>c;
    for(int i=1;i<=m;i++){
        cin>>b[i];
    }
    for(int i=1;i<=n;i++){
        int res=0;
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
            res+=a[i][j]*b[j];
        }
        if(res+c>0)cnt++;
    }
    cout<<cnt<<endl;

    return 0;
}

Measured memory_bytes: 256