#pragma optimize("Bismillahirrahmanirrahim")
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//Allahuekber
//ahmet23 orz...
//Sani buyuk Osman Pasa Plevneden cikmam diyor.
//FatihSultanMehmedHan
//YavuzSultanSelimHan
//AbdulhamidHan
#define author tolbi
#include <bits/stdc++.h>
using namespace std;
template<typename X, typename Y> istream& operator>>(istream& in, pair<X,Y> &pr) {return in>>pr.first>>pr.second;}
template<typename X, typename Y> ostream& operator<<(ostream& os, pair<X,Y> pr) {return os<<pr.first<<" "<<pr.second;}
template<typename X, typename Y> pair<X,Y> operator+(pair<X,Y> a, pair<X,Y> b) {pair<X,Y> c; c.first=a.first+b.first,c.second=a.second+b.second;return c;}
template<typename X, typename Y> pair<X,Y> operator-(pair<X,Y> a, pair<X,Y> b) {pair<X,Y> c; c.first=a.first-b.first,c.second=a.second-b.second;return c;}
template<typename X, typename Y> void operator+=(pair<X,Y> &a, pair<X,Y> b){a.first+=b.first,a.second+=b.second;}
template<typename X, typename Y> void operator-=(pair<X,Y> &a, pair<X,Y> b){a.first-=b.first,a.second-=b.second;}
template<typename X> istream& operator>>(istream& in, vector<X> &arr) {for(auto &it : arr) in>>it; return in;}
template<typename X> ostream& operator<<(ostream& os, vector<X> arr) {for(auto &it : arr) os<<it<<" "; return os;}
template<typename X, size_t Y> istream& operator>>(istream& in, array<X,Y> &arr) {for(auto &it : arr) in>>it; return in;}
template<typename X, size_t Y> ostream& operator<<(ostream& os, array<X,Y> arr) {for(auto &it : arr) os<<it<<" "; return os;}
#define int long long
#define endl '\n'
#define vint(x) vector<int> x
#define deci(x) int x;cin>>x;
#define decstr(x) string x;cin>>x;
#define cinarr(x) for (auto &it : x) cin>>it;
#define coutarr(x) for (auto &it : x) cout<<it<<" ";cout<<endl;
#define sortarr(x) sort(x.begin(),x.end())
#define sortrarr(x) sort(x.rbegin(),x.rend())
#define det(x) cout<<"NO\0YES"+x*3<<endl;
#define INF LONG_LONG_MAX
#define rev(x) reverse(x.begin(),x.end());
#define ios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define tol(bi) (1LL<<((int)(bi)))
const int MOD = 1e9+7;
mt19937 ayahya(chrono::high_resolution_clock().now().time_since_epoch().count());
#include "paint.h"
int32_t minimumInstructions(int32_t N, int32_t M, int32_t K, vector<int32_t> C, vector<int32_t> A, vector<vector<int32_t>> B) {
int32_t ans = 1, r = M-1, mavava = M-1;
auto valid = [&](int node)->bool{
for (int i = 0; i < M; i++){
bool boolean=true;
for (int j = 0; j < M; j++){
int pos = node+j;
boolean=false;
for (int k = 0; k < B[(i+j)%M].size(); k++){
if (C[pos]==B[(i+j)%M][k]){
boolean=true;
break;
}
}
if (!boolean) break;
}
if (boolean) return true;
}
return false;
};
if (!valid(0)) return -1;
for (int i = 1; i < N; i++){
if (valid(i)) mavava=i+M-1;
if (i>r){
if (mavava==r) return -1;
r=mavava;
ans++;
}
}
return ans;
}
#ifdef tolbi
int32_t main() {
int32_t N, M, K;
assert(3 == scanf("%d %d %d", &N, &M, &K));
vector<int32_t> C(N);
for (int32_t i = 0; i < N; ++i) {
assert(1 == scanf("%d", &C[i]));
}
vector<int32_t> A(M);
vector<vector<int32_t>> B(M);
for (int32_t i = 0; i < M; ++i) {
assert(1 == scanf("%d", &A[i]));
B[i].resize(A[i]);
for (int32_t j = 0; j < A[i]; ++j) {
assert(1 == scanf("%d", &B[i][j]));
}
}
int32_t minimum_instructions = minimumInstructions(N, M, K, C, A, B);
printf("%d\n", minimum_instructions);
return 0;
}
#endif
