Problem: When Kefa came to the restaurant and sat at a table, the waiter immediately brought him the menu. There were n dishes. Kefa knows that he needs exactly m dishes. But at that, he doesn't want to order the same dish twice to taste as many dishes as possible. 

Kefa knows that the i-th dish gives him ai units of satisfaction. But some dishes do not go well together and some dishes go very well together. Kefa set to himself k rules of eating food of the following type — if he eats dish x exactly before dish y (there should be no other dishes between x and y), then his satisfaction level raises by c. 

Of course, our parrot wants to get some maximal possible satisfaction from going to the restaurant. Help him in this hard task!

Input

The first line of the input contains three space-separated numbers, n, m and k (1 ≤ m ≤ n ≤ 18, 0 ≤ k ≤ n * (n - 1)) — the number of dishes on the menu, the number of portions Kefa needs to eat to get full and the number of eating rules.

The second line contains n space-separated numbers ai, (0 ≤ ai ≤ 109) — the satisfaction he gets from the i-th dish.

Next k lines contain the rules. The i-th rule is described by the three numbers xi, yi and ci (1 ≤ xi, yi ≤ n, 0 ≤ ci ≤ 109). That means that if you eat dish xi right before dish yi, then the Kefa's satisfaction increases by ci. It is guaranteed that there are no such pairs of indexes i and j (1 ≤ i < j ≤ k), that xi = xj and yi = yj.

Output

In the single line of the output print the maximum satisfaction that Kefa can get from going to the restaurant.

Examples

Input

2 2 1
1 1
2 1 1


Output

3


Input

4 3 2
1 2 3 4
2 1 5
3 4 2


Output

12

Note

In the first sample it is best to first eat the second dish, then the first one. Then we get one unit of satisfaction for each dish and plus one more for the rule.

In the second test the fitting sequences of choice are 4 2 1 or 2 1 4. In both cases we get satisfaction 7 for dishes and also, if we fulfill rule 1, we get an additional satisfaction 5.

Solution (in JAVA):

Solution:
import java.util.*;
import java.io.*;
import java.math.*;

public class BasicJava 
{
   public static void main(String[] args) 
   {
      Task Main = new Task();
      
      Main.solve();   
   }
   
   public static class Task
   {
      InputReader in = new InputReader(System.in);
      PrintWriter out = new PrintWriter(System.out);
      
      public class date
      {
         int x, y;
      }
      
      public int nrOfBits(int x)
      {
         int l = 0;
         while (x > 0) {
            
            if (x % 2 == 1) l++;
            
            x = x / 2;
            
         }
         
         return l;
      }
      
      public void solve()
      {
         int n = in.nextInt();
         int m = in.nextInt();
         int k = in.nextInt();
         
         int[] t = new int[25];
         long[][] dp = new long[19][(1<<18) + 10];
         int[][] v = new int[25][25];
         
         for (int i = 0; i < n; i++) t[i] = in.nextInt();
         
         for (int i = 1; i <= k; i++) {
            
            int x = in.nextInt();
            int y = in.nextInt();
            int c = in.nextInt();
            
            v[x - 1][y - 1] += c;
            
         }
         
         for (int i = 0; i < n; i++) dp[i][1 << i] = t[i];
         
         for (int i = 0; i < (1<<n); i++) 
            for (int j = 0; j < n; j++) {
               
               if (((i >> j) & 1) == 1) {
                  
                  for (int kk = 0; kk < n; kk++)
                     if (((i >> kk) & 1) == 0)
                           dp[kk][i + (1 << kk)] = Math.max(dp[kk][i + (1 << kk)], dp[j][i] + t[kk] + v[j][kk]);
                  
               }
               
               if (i >> j == 0) break;
            }
         
         long sol = 0;
         
         for (int i = 0; i < (1<<n); i++)
            for (int j = 0; j < n; j++)
               if (nrOfBits(i) <= m) sol = Math.max(sol, dp[j][i]);
         
         out.println(sol);
         out.close();
         
      }
   }

   static class InputReader
   {
      private InputStream stream;
      private byte[] buf = new byte[2048];
      private int curChar;
      private int numChars;
 
      public InputReader(InputStream stream)
      {
         this.stream = stream;
      }
 
      public int read()
      {
         if (numChars == -1)
            throw new UnknownError();
         if (curChar >= numChars)
         {
            curChar = 0;
            try
            {
               numChars = stream.read(buf);
            }
            catch (IOException e)
            {
               throw new UnknownError();
            }
            if (numChars <= 0)
               return -1;
         }
         return buf[curChar++];
      }
 
      public int peek()
      {
         if (numChars == -1)
            return -1;
         if (curChar >= numChars)
         {
            curChar = 0;
            try
            {
               numChars = stream.read(buf);
            }
            catch (IOException e)
            {
               return -1;
            }
            if (numChars <= 0)
               return -1;
         }
         return buf[curChar];
      }
 
      public void skip(int x)
      {
         while (x-- > 0)
            read();
      }
 
      public int nextInt()
      {
         return Integer.parseInt(next());
      }
 
      public long nextLong()
      {
         return Long.parseLong(next());
      }
 
      public String nextString()
      {
         return next();
      }
 
      public String next()
      {
         int c = read();
         while (isSpaceChar(c))
            c = read();
         StringBuffer res = new StringBuffer();
         do
         {
            res.appendCodePoint(c);
            c = read();
         }
         while (!isSpaceChar(c));
 
         return res.toString();
      }
 
      public String nextLine()
      {
         StringBuffer buf = new StringBuffer();
         int c = read();
         while (c != '\n' && c != -1)
         {
            if (c != '\r')
               buf.appendCodePoint(c);
            c = read();
         }
         return buf.toString();
      }
 
      public double nextDouble()
      {
         int c = read();
         while (isSpaceChar(c))
            c = read();
         int sgn = 1;
         if (c == '-')
         {
            sgn = -1;
            c = read();
         }
         double res = 0;
         while (!isSpaceChar(c) && c != '.')
         {
            if (c == 'e' || c == 'E')
               return res * Math.pow(10, nextInt());
            if (c < '0' || c > '9')
               throw new InputMismatchException();
            res *= 10;
            res += c - '0';
            c = read();
         }
         if (c == '.')
         {
            c = read();
            double m = 1;
            while (!isSpaceChar(c))
            {
               if (c == 'e' || c == 'E')
                  return res * Math.pow(10, nextInt());
               if (c < '0' || c > '9')
                  throw new InputMismatchException();
               m /= 10;
               res += (c - '0') * m;
               c = read();
            }
         }
         return res * sgn;
      }
 
      public boolean hasNext()
      {
         int value;
         while (isSpaceChar(value = peek()) && value != -1)
            read();
         return value != -1;
      }
 
      private boolean isSpaceChar(int c)
      {
         return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
      }
 
   }
}