//Coded by Chirath Nirodha
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//using namespace __gnu_pbds;
using namespace std;
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define P push
#define I insert
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
const string abc="abcdefghijklmnopqrstuvwxyz";
const string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
//typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
const ll mod=1e9+7;
const ll inf=1000000000000;
inline void io(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
}
void solve(){
io();
ll n,t,s;cin>>n>>t>>s;
ll p[t+1];p[0]=0;
int last[t+1][n+1];
memset(last,0,sizeof(last));
for(int i=1;i<=t;i++){
cin>>p[i];
p[i]+=p[i-1];
}
for(int i=1;i<=n;i++){
string str;cin>>str;
for(int j=0;j<t;j++){
if(str[j]=='1')last[j+1][i]=last[j][i];
else last[j+1][i]=j+1;
}
}
for(int i=1;i<=t;i++){
last[i][0]=i;
sort(last[i],last[i]+n+1);
}
ll dp[t+1][s+1];
for(int i=0;i<=t;i++)for(int j=0;j<=s;j++)dp[i][j]=inf;
dp[0][0]=0;
ll best[n+1];
for(int i=1;i<=s;i++){
for(int j=0;j<=n;j++)best[j]=inf;
for(int j=1;j<=t;j++){
for(ll k=0;k<=n;k++){
for(int l=last[j-1][k];l<last[j][k];l++)
best[k] = min(best[k],dp[l][i-1]-p[l]*k);
dp[j][i]=min(dp[j][i],best[k]+p[j]*k);
}
}
cout<<dp[t][i]<<endl;
}
}
int main(){
io();
solve();
//int t;cin>>t;for(int i=0;i<t;i++)solve();
return 0;
}
