#include <bits/stdc++.h>
// #include "september.h"
using namespace std;
const int MAXN = 2e5 + 11;
int l[MAXN], r[MAXN];
vector < int > g[MAXN];
void dfs(int v){
for(int u : g[v]){
dfs(u);
if(v && l[v] <= r[u])
l[v] = min(l[v], l[u]), r[v] = max(r[v], r[u]);
}
}
int solve(int N, int M, vector<int> F, vector<vector<int>> S) {
for(int i = 0; i < N; i++) g[i].clear(), r[i] = -1, l[i] = 1e9;
for(int i = 1; i < N; i++) g[F[i]].push_back(i);
for(int i = 0; i < M; i++)
for(int j = 0; j < N - 1; j++)
l[S[i][j]] = min(l[S[i][j]], j),
r[S[i][j]] = max(r[S[i][j]], j);
dfs(0);
vector < pair < int, int > > vec;
for(int i = 1; i < N; i++) vec.push_back({l[i], r[i]});
sort(vec.begin(), vec.end());
int cnt = 1, L = vec[0].first, R = vec[0].second;
for(int i = 1; i < N - 1; i++){
if(L <= vec[i].first && vec[i].first <= R) R = max(R, vec[i].second);
else cnt++, L = vec[i].first, R = vec[i].second;
}
return cnt;
}
