package main

import (
	"bufio"
	"os"
	"strconv"
	"fmt"
)

func main() {
	sc := NewScanner()

	N := sc.NextInt()
	stay := make([]int, N)
	for i := 0; i < N; i++ {
		stay[i] = sc.NextInt()
	}
	edge := make([][]int, N)
	for i := 0; i < N; i++ {
		edge[i] = make([]int, N)
		fill(edge[i], -1)
	}

	M := sc.NextInt()
	for i := 0; i < M; i++ {
		A, B, C := sc.NextInt(), sc.NextInt(), sc.NextInt()
		edge[A][B] = C
		edge[B][A] = C
	}

	for k := 0; k < N; k++ {
		for i := 0; i < N; i++ {
			if edge[i][k] == -1 {
				continue
			}

			for j := 0; j < N; j++ {
				if edge[k][j] == -1 {
					continue
				}
				if edge[i][j] == -1 || edge[i][j] > edge[i][k] + edge[k][j] {
					edge[i][j] = edge[i][k] + edge[k][j]
				}
			}
		}
	}
	mn := -1
	for i := 1; i < N - 1; i++ {
		if edge[0][i] == -1 {
			continue
		}
		for j := 1; j < N - 1; j++ {
			if i == j {
				continue
			}
			if edge[i][j] == -1 || edge[i][N - 1] == -1 {
				continue
			}

			s := edge[0][i] + edge[i][j] + edge[j][N - 1] + stay[i] + stay[j]
			if mn == -1 || mn > s {
				mn = s
			}
		}
	}
	fmt.Println(mn)

}

type Scanner struct {
	r   *bufio.Reader
	buf []byte
	p   int
}

func NewScanner() *Scanner {
	rdr := bufio.NewReaderSize(os.Stdin, 1000)
	return &Scanner{r:rdr}
}
func (s *Scanner) Next() string {
	s.pre()
	start := s.p
	for ; s.p < len(s.buf); s.p++ {
		if s.buf[s.p] == ' ' {
			break
		}
	}
	result := string(s.buf[start:s.p])
	s.p++
	return result
}
func (s *Scanner) NextLine() string {
	s.pre()
	start := s.p
	s.p = len(s.buf)
	return string(s.buf[start:])
}
func (s *Scanner) NextInt() int {
	v, _ := strconv.Atoi(s.Next())
	return v
}
func (s *Scanner) NextInt64() int64 {
	v, _ := strconv.ParseInt(s.Next(), 10, 64)
	return v
}

func (s *Scanner) NextIntArray() []int {
	s.pre()
	start := s.p
	result := []int{}
	for ; s.p < len(s.buf) + 1; s.p++ {
		if s.p == len(s.buf) || s.buf[s.p] == ' ' {
			v, _ := strconv.ParseInt(string(s.buf[start:s.p]), 10, 0)
			result = append(result, int(v))
			start = s.p + 1
		}
	}

	return result
}
func (s *Scanner) NextInt64Array() []int64 {
	s.pre()
	start := s.p
	result := []int64{}
	for ; s.p < len(s.buf) + 1; s.p++ {
		if s.p == len(s.buf) || s.buf[s.p] == ' ' {
			v, _ := strconv.ParseInt(string(s.buf[start:s.p]), 10, 64)
			result = append(result, v)
			start = s.p + 1
		}
	}
	return result
}

func (s *Scanner) NextMap() map[int]bool {
	s.pre()
	start := s.p
	mp := map[int]bool{}
	for ; s.p < len(s.buf); s.p++ {
		if s.buf[s.p] == ' ' {
			v, _ := strconv.Atoi(string(s.buf[start:s.p]))
			mp[v] = true
			start = s.p + 1
		}
	}
	v, _ := strconv.Atoi(string(s.buf[start:s.p]))
	mp[v] = true

	return mp
}

func (s *Scanner) pre() {
	if s.p >= len(s.buf) {
		s.readLine()
		s.p = 0
	}
}
func (s *Scanner) readLine() {
	s.buf = make([]byte, 0)
	for {
		l, p, e := s.r.ReadLine()
		if e != nil {
			panic(e)
		}
		s.buf = append(s.buf, l...)
		if !p {
			break
		}
	}
}
func fill(arr []int, v int) {
	for i := 0; i < len(arr); i++ {
		arr[i] = v
	}
}
func min(a int, b int) int {
	if a < b {
		return a
	}
	return b
}