#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define all(c) c.begin(), c.end()
#define endl "\n"
const double PI=3.141592653589;
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define dbg(x...) cerr << "LINE(" << __LINE__ << ") -> " <<"[" << #x << "] = ["; _print(x)
#else
#define dbg(x...)
#endif
void solve()
{
int L,n;
cin >> L >> n;
vector<pair<int,int>>tot;
for(int i = 1;i<=n;++i){
int x;
cin >> x;
vector<int>a(x+1);
int sum = 0;
for(int j= 1;j<=x;++j)cin >> a[j],sum+=a[j];
int space = L-sum;
sum = 0;
int curr = 1;
vector<pair<int,int>>range;
for(int j = 1;j<=x;++j){
if(space)range.pb({curr,curr+space-1});
sum+=a[j];
curr = sum+1;
}
if(space)range.pb({curr,L});
vector<pair<int,int>>not_safe;
for(int j = 1;j<(int)(range.size());++j){
if(range[j].first > range[j-1].second+1)not_safe.pb({range[j-1].second+1,range[j].first-1});
}
for(auto x : not_safe)tot.pb(x);
}
sort(all(tot));
int res = 0;
int r = 1;
if(!tot.empty())r = tot[0].second, res+= (tot[0].second-tot[0].first+1);
for(int j = 1;j<(int)(tot.size());++j){
if(tot[j].second > r){
res+=tot[j].second-max(r+1,tot[j].first)+1;
}
r = max(r, tot[j].second);
}
cout << res << endl;
}
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
int T=1;
for(int i = 1;i<=T;++i)
{
// cout << "Case #" << i << ": ";
solve();
}
}
