#include<iostream>
#include<math.h>
#include<algorithm>
#include<stdio.h>
#include<map>
#include<vector>
#include<set>
#include<iomanip>
#define F first
#define S second
#define P system("PAUSE");
#define H return 0;
#define pb push_back
using namespace std;
const long long A=100000000000000LL,N=1228228;
 
long long mask,i,j,n,m,k,a[N],b[N],x,y,z,c[21][21],o,ot,dp[N][21];
 
long long len(long long mask){
	long long k=0;
	for(i=0;i<n;i++)if(mask&b[i])k++;
	return k;
}
 
int main(){
	cin>>n>>m>>k;
	for(i=0;i<n;i++)scanf("%d",&a[i]);
	b[0]=1;
	for(i=1;i<=n;i++)b[i]=b[i-1]*2;
	while(k--)scanf("%d%d%d",&x,&y,&z),c[x-1][y-1]=z;
	for(i=0;i<n;i++)dp[b[i]][i]=a[i];
	for(mask=0;mask<b[n];mask++)for(i=0;i<n;i++)if(mask&b[i]){
        for(j=0;j<n;j++)if((mask&b[j])==0)dp[(mask|b[j])][j]=max(dp[(mask|b[j])][j],dp[mask][i]+c[i][j]+a[j]);
	}
	for(mask=0;mask<b[n];mask++)if(len(mask)==m)for(i=0;i<n;i++)o=max(o,dp[mask][i]);
	cout<<o<<"\n";
}

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