#include<stdio.h>
#include<stdlib.h>

#define POS(i,j) ((i)*n+(j))
#define MAX(a,b) ((a)>(b)?(a):(b))

int calc(int bit,int n,int *score,int *dp){
  if(dp[bit]>=0) return dp[bit];

  int res=0;
  int i;
  for(i=0;i<n;i++){
    if((bit>>i)&0x01){
      int j;
      int point=0;
      for(j=0;j<n;j++){
	point+=((bit>>j)&0x01)*score[POS(i,j)];
      }
      res=MAX(res,point+calc(bit^(1<<i),n,score,dp));
    }
  }
  dp[bit]=res;
  return res;
}

void run(void){
  int n,m;
  scanf("%d%d",&n,&m);

  int *score=(int *)calloc(n*n,sizeof(int));
  int i;
  for(i=0;i<m;i++){
    int i1,i2,p;
    scanf("%d%d%d",&i1,&i2,&p);
    score[POS(i1,i2)]=p;
  }

  int *dp=(int *)malloc(sizeof(int)*(1<<n));
  for(i=0;i<(1<<n);i++){
    dp[i]=-1;
  }
  dp[0]=0;

  int ans=calc((1<<n)-1,n,score,dp);
  printf("%d\n",ans);
  free(score);
  free(dp);
  return;
}

int main(void){
  run();
  return 0;
}