## https://yukicoder.me/problems/no/1690

class UnionFind:
    """
    UnionFindの基本的な処理を実装したクラス
    """

    def __init__(self, size):
        self.root = [i for i in range(size)]
        self.size = [1] * size

    def get_root(self, v):
        if v == self.root[v]:
            return v
        else:
            old_root = self.root[v]
            new_root = self.get_root(old_root)
            self.root[v] = new_root
            return new_root

    def merge(self, u, v):
        root_u = self.get_root(u)
        root_v = self.get_root(v)
        if root_u == root_v:
            return False

        if self.size[root_u] >= self.size[root_v]:
            self.size[root_u] += self.size[root_v]
            self.root[root_v] = root_u
            self.root[v] = root_u
        else:
            self.size[root_v] += self.size[root_u]
            self.root[root_u] = root_v
            self.root[u] = root_v
        return True
    

def main():
    N, M, K = map(int, input().split())
    A = list(map(int, input().split()))
    edges = []
    for _ in range(M):
        x, y, z = map(int, input().split())
        edges.append((x - 1, y - 1, z))

    # 2点間の距離を求める
    dist_matrix = [[float("inf")] * N for _ in range(N)]
    for i in range(N):
        dist_matrix[i][i] = 0
    for x, y, z in edges:
        dist_matrix[x][y] = z
        dist_matrix[y][x] = z
    for k in range(N):
        for i in range(N):
            for j in range(N):
                dist_matrix[i][j] = min(dist_matrix[i][j], dist_matrix[i][k] + dist_matrix[k][j])
    
    dist_array = []
    for i in range(N):
        for j in range(i + 1, N):
            dist_array.append((i, j, dist_matrix[i][j]))
    dist_array.sort(key=lambda x: x[2])


    answer_cost = float("inf")
    for bit in range(2 ** N):
        count = 0
        array = []
        cost = 0
        for i in range(N):
            if bit >> i & 1:
                cost += A[i]
                count += 1
                array.append(i)
        
        uf = UnionFind(N)
        if count == K:
            for i, j, z in dist_array:
                bi = (1 << i) | (1 << j)
                if bi & bit == bi:
                    if uf.merge(i, j):
                        cost += z
            answer_cost = min(answer_cost, cost)
    print(answer_cost)

        
    



if __name__ == "__main__":
    main()