369C

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define f first
#define s second
#define pb push_back
#define fix  cout<<std::fixed;
#define mk make_pair
#define N 100005
#define mod 1000000007
#define time  cerr<< '\n' << "Time elapsed :" << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n" ;
#define IOS        ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n,m,k;
ll a[105],val[105][105];
ll dp[105][105][105];
ll rec(ll id,ll b,ll col)
{  
    if(id==n+1)
  {
    if(b==k) return 0;
    else return 1e18;
  }
   if(dp[id][b][col]!=-1) return dp[id][b][col];
   if(a[id]==0)
    {
        ll t=1e18;
    for(int i=1;i<=m;i++)
    {
       if(col!=i)
       {
         t=min(t,val[id][i]+rec(id+1,b+1,i));
       }
       else t=min(t,val[id][col]+rec(id+1,b,col));
    }
    return dp[id][b][col]=t;
   }
   else
   {
     if(col==a[id])
        return dp[id][b][col]=rec(id+1,b,col);
    else 
        return dp[id][b][col]=rec(id+1,b+1,a[id]);
   }
}

int main()
{
   cin>>n>>m>>k;
   for(int i=1;i<=n;i++)cin>>a[i];
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)cin>>val[i][j];
memset(dp,-1,sizeof(dp));
ll ans=rec(1,0,0);
            if(ans==1e18)cout<<-1;
            else
            cout<<ans;

}