package main import ( "bufio" "fmt" "math" "os" "sort" "strconv" ) func exec(stdin *Stdin, stdout *Stdout) { n := stdin.ReadInt() a := make([]int, n) for i := 0; i < n; i++ { a[i] = stdin.ReadInt() } sort.Ints(a) c := []int{} d := []int{0} for i := 0; i < n; i++ { if d[len(d)-1] == a[i] { c[len(c)-1]++ } else { c = append(c, 1) d = append(d, a[i]) } } if len(c) < 3 { stdout.Println(0) return } ans := 0 left := c[0] right := n - c[0] - c[1] for i := 1; i < len(c); i++ { ans += left * right % 1000000007 ans %= 1000000007 left += c[i] right -= c[i] } stdout.Println(ans) } func main() { stdout := NewStdout() defer stdout.Flush() exec(NewStdin(bufio.ScanWords), stdout) } type Stdin struct { stdin *bufio.Scanner } func NewStdin(split bufio.SplitFunc) *Stdin { s := Stdin{bufio.NewScanner(os.Stdin)} s.stdin.Split(split) s.stdin.Buffer(make([]byte, bufio.MaxScanTokenSize), int(math.MaxInt32)) return &s } func (s *Stdin) Read() string { s.stdin.Scan() return s.stdin.Text() } func (s *Stdin) ReadInt() int { n, _ := strconv.Atoi(s.Read()) return n } func (s *Stdin) ReadFloat64() float64 { n, _ := strconv.ParseFloat(s.Read(), 64) return n } type Stdout struct { stdout *bufio.Writer } func NewStdout() *Stdout { return &Stdout{bufio.NewWriter(os.Stdout)} } func (s *Stdout) Flush() { s.stdout.Flush() } func (s *Stdout) Println(a ...interface{}) { fmt.Fprintln(s.stdout, a...) }