#include <stdio.h>

#define INF 2000000000000001LL

typedef struct list {
  int v;
  int c;
  long long d;
  struct list *n;
  struct list *rev;
} list;

void upheap (long long q[][2], int idx) {
  int pidx = (idx-1)/2;
  
  if (idx > 0 && q[pidx][0] > q[idx][0]) {
    long long s = q[idx][0];
    q[idx][0] = q[pidx][0];
    q[pidx][0] = s;
    s = q[idx][1];
    q[idx][1] = q[pidx][1];
    q[pidx][1] = s;
    upheap(q, pidx);
  }
  
  return;
}

void downheap (long long q[][2], int idx, int size) {
  int chidx = -1;
  long long ch[2] = { INF, INF };
  
  if (2*idx+1 >= size) {
    return;
  }
  
  ch[0] = q[2*idx+1][0];
  if (2*idx+2 < size) {
    ch[1] = q[2*idx+2][0];
  }
  
  if (ch[1] < ch[0] && ch[1] < q[idx][0]) {
    chidx = 2*idx+2;
  } else if (ch[0] < q[idx][0]) {
    chidx = 2*idx+1;
  }
  
  if (chidx > 0) {
    long long s = q[idx][0];
    q[idx][0] = q[chidx][0];
    q[chidx][0] = s;
    s = q[idx][1];
    q[idx][1] = q[chidx][1];
    q[chidx][1] = s;
    downheap(q, chidx, size);
  }
  
  return;
}

void dequeue (long long q[][2], int *size, long long *res) {
  res[0] = q[0][0];
  res[1] = q[0][1];
  if (*size > 0) {
    *size -= 1;
    q[0][0] = q[*size][0];
    q[0][1] = q[*size][1];
    downheap(q, 0, *size);
  }
  return;
}

int main () {
  int k = 0;
  int n = 0;
  int m = 0;
  int a = 0;
  int b[2000] = {};
  int u = 0;
  int v = 0;
  long long d = 0LL;
  
  int res = 0;
  
  long long ans = 0LL;
  long long ad[2002] = {};
  long long td[2002] = {};
  
  int cnt[2000] = {};
  
  list pool[16000] = {};
  int used = 0;
  
  list *e[2002] = {};
  
  list *prev[2002] = {};
  
  long long q[16000][2] = {};
  
  res = scanf("%d", &k);
  res = scanf("%d", &n);
  res = scanf("%d", &m);
  for (int i = 0; i < k; i++) {
    res = scanf("%d", &a);
    cnt[a-1]++;
  }
  for (int i = 0; i < n; i++) {
    res = scanf("%d", b+i);
  }
  for (int i = 0; i < m; i++) {
    res = scanf("%d", &u);
    res = scanf("%d", &v);
    res = scanf("%lld", &d);
    pool[used].v = v;
    pool[used].c = k;
    pool[used].d = d;
    pool[used].n = e[u];
    pool[used].rev = pool+(used+1);
    e[u] = pool+used;
    used++;
    pool[used].v = u;
    pool[used].c = 0;
    pool[used].d = d*(-1LL);
    pool[used].n = e[v];
    pool[used].rev = pool+(used-1);
    e[v] = pool+used;
    used++;
    pool[used].v = u;
    pool[used].c = k;
    pool[used].d = d;
    pool[used].n = e[v];
    pool[used].rev = pool+(used+1);
    e[v] = pool+used;
    used++;
    pool[used].v = v;
    pool[used].c = 0;
    pool[used].d = d*(-1LL);
    pool[used].n = e[u];
    pool[used].rev = pool+(used-1);
    e[u] = pool+used;
    used++;
  }
  
  for (int i = 0; i < n; i++) {
    pool[used].v = i+1;
    pool[used].c = cnt[i];
    pool[used].d = 0LL;
    pool[used].n = e[0];
    pool[used].rev = pool+(used+1);
    e[0] = pool+used;
    used++;
    pool[used].v = 0;
    pool[used].c = 0;
    pool[used].d = 0LL;
    pool[used].n = e[i+1];
    pool[used].rev = pool+(used-1);
    e[i+1] = pool+used;
    used++;
    pool[used].v = n+1;
    pool[used].c = b[i];
    pool[used].d = 0LL;
    pool[used].n = e[i+1];
    pool[used].rev = pool+(used+1);
    e[i+1] = pool+used;
    used++;
    pool[used].v = i+1;
    pool[used].c = 0;
    pool[used].d = 0LL;
    pool[used].n = e[n+1];
    pool[used].rev = pool+(used-1);
    e[n+1] = pool+used;
    used++;
  }
  
  while (k > 0) {
    int qsize = 0;
    int idx = n+1;
    for (int i = 0; i < n+2; i++) {
      td[i] = INF;
    }
    td[0] = 0LL;
    q[qsize][0] = 0LL;
    q[qsize][1] = 0LL;
    upheap(q, qsize);
    qsize++;
    while (qsize > 0) {
      long long tmp[2] = {};
      dequeue(q, &qsize, tmp);
      if (tmp[0] == td[(int)(tmp[1])]) {
        list *l = e[(int)(tmp[1])];
        while (l != NULL) {
          if (l->c > 0 && td[l->v] > tmp[0]+l->d) {
            td[l->v] = tmp[0]+l->d;
            prev[l->v] = l;
            q[qsize][0] = td[l->v];
            q[qsize][1] = (long long)(l->v);
            upheap(q, qsize);
            qsize++;
          }
          l = l->n;
        }
      }
    }
    while (idx > 0) {
      list *l = prev[idx];
      l->c--;
      l->rev->c++;
      idx = l->rev->v;
    }
    for (int i = 0; i < n+2; i++) {
      list *l = e[i];
      ad[i] += td[i];
      while (l != NULL) {
        l->d += td[i]-td[l->v];
        l = l->n;
      }
    }
    ans += ad[n+1];
    k--;
  }
  
  printf("%lld\n", ans);
  return 0;
}