#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
#define REP(i, n) for(int i = 0;i < n;i ++)
#define REP1(i, n) for(int i = 1;i <= n;i ++)
#define FILL(i, n) memset(i, n, sizeof(i))
#define X first
#define Y second
#define pb push_back
#define SZ(_a) ((int)(_a).size())
#define ALL(_a) (_a).begin(), (_a).end()
#ifdef brian
#define IOS()
template<typename T>void _do(T &&x){cerr<<x<<endl;}
template<typename T, typename ...t>void _do(T &&x, t &&...X){cerr<<x<<", ";_do(X...);}
#define debug(...) {\
fprintf(stderr, "%s - %d (%s) = ", __PRETTY_FUNCTION__, __LINE__, #__VA_ARGS__);\
_do(__VA_ARGS__);\
}
#else
#define debug(...)
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#define endl '\n'
#endif
const ll MAXn = 1e5 + 5;
const ll INF = ll(1e18);
const ll MOD = 1000000007;
ll a[MAXn], b[MAXn], c[MAXn];
ll fg[MAXn], mn[MAXn];
map<ii, ll> mp;
vector<ii> dt;
ll n, m;
ll d[MAXn];
ll chk(ll x)
{
REP1(i, n)d[i] = 0;
for(int i = 0, I = 1;i < SZ(dt);i ++, I<<=1)
{
if(I & x)for(int j = dt[i].X;j < dt[i].Y;j ++)d[j]++;
else
{
for(int j = 1;j < dt[i].X;j ++)d[j] ++;
for(int j = dt[i].Y;j <= n;j ++)d[j] ++;
}
}
ll mx = 0;
REP1(i, n)mx = max(mx, d[i]);
return mx;
}
int main(){
IOS();
cin>>n>>m;
REP1(i, m)cin>>a[i]>>b[i]>>c[i];
REP1(i, m)if(a[i] > b[i])swap(a[i], b[i]);
REP1(i, m)mp[ii(a[i], b[i])]++;
ll tmptt = 0;
for(auto &p:mp)
{
tmptt += p.Y / 2;
if(p.Y & 1)dt.pb(p.X);
}
ll ans = INF;
REP(I, (1<<SZ(dt)))ans = min(ans, chk(I));
cout<<ans + tmptt<<endl;
}
