#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
typedef long long ll;
const int N=505,M=1e5,INF=1e9;
inline int read(){
    char c=getchar();int x=0,f=1;
    while(c<‘0‘||c>‘9‘){if(c==‘-‘)f=-1; c=getchar();}
    while(c>=‘0‘&&c<=‘9‘){x=x*10+c-‘0‘; c=getchar();}
    return x*f;
}
int n,m,u,v,w,s,t;
struct edge{
    int v,ne,c,f,w;
}e[M<<1];
int cnt,h[N];
inline void ins(int u,int v,int c,int w){
    cnt++;
    e[cnt].v=v;e[cnt].c=c;e[cnt].f=0;e[cnt].w=w;
    e[cnt].ne=h[u];h[u]=cnt;
    cnt++;
    e[cnt].v=u;e[cnt].c=0;e[cnt].f=0;e[cnt].w=-w;
    e[cnt].ne=h[v];h[v]=cnt;
}
int d[N],pre[N],pos[N],q[N],head=1,tail=1,inq[N];
inline void lop(int &x){if(x==N) x=1;else if(x==0) x=N-1;}
bool spfa(){
    memset(d,127,sizeof(d));
    d[s]=0;pre[t]=-1;
    head=tail=1;
    memset(inq,0,sizeof(inq));
    q[tail++]=s;inq[s]=1;
    while(head!=tail){
        int u=q[head++];lop(head);inq[u]=0;
        for(int i=h[u];i;i=e[i].ne){
            int v=e[i].v,w=e[i].w;
            if(d[v]>d[u]+w&&e[i].c>e[i].f){
                d[v]=d[u]+w;
                pre[v]=u;
                pos[v]=i;
                if(!inq[v]){
                    if(d[v]<d[q[head]]) head--,lop(head),q[head]=v;
                    else q[tail++]=v,lop(tail);
                    inq[v]=1;
                }
            }
        }
    }
    return pre[t]==-1?0:1;
}
int mcmf(){
    int flow=0,cost=0;
    while(spfa()){
        int f=INF;
        for(int i=t;i!=s;i=pre[i]) f=min(f,e[pos[i]].c-e[pos[i]].f);
        flow+=f;
        cost+=f*d[t];
        for(int i=t;i!=s;i=pre[i]){
            e[pos[i]].f+=f;
            e[((pos[i]-1)^1)+1].f-=f;
        }
    }
    return cost;
}

int g[N][N];
int main(){
    //freopen("in.txt","r",stdin);
    int T=read();
while(T--){
    cnt=0;
    memset(h,0,sizeof(h));
    n=read();m=read();s=0;t=n+n+1;
    for(int i=1;i<=n;i++){
        ins(s,i,1,0),ins(n+i,t,1,0);
        for(int j=1;j<=n;j++) g[i][j]=INF;
    }
    
    for(int i=1;i<=m;i++) u=read(),v=read(),w=read(),g[u][v]=min(g[u][v],w);
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++) 
            if(g[i][j]<INF) ins(i,j+n,1,g[i][j]);
    printf("%d\n",mcmf());
}
}