package main import ( "bufio" "fmt" "io" "os" "strconv" ) var iost *Iost type Iost struct { Scanner *bufio.Scanner Writer *bufio.Writer } func NewIost(fp io.Reader, wfp io.Writer) *Iost { const BufSize = 2000005 scanner := bufio.NewScanner(fp) scanner.Split(bufio.ScanWords) scanner.Buffer(make([]byte, BufSize), BufSize) return &Iost{Scanner: scanner, Writer: bufio.NewWriter(wfp)} } func (i *Iost) Text() string { if !i.Scanner.Scan() { panic("scan failed") } return i.Scanner.Text() } func (i *Iost) Atoi(s string) int { x, _ := strconv.Atoi(s); return x } func (i *Iost) GetNextInt() int { return i.Atoi(i.Text()) } func (i *Iost) Atoi64(s string) int64 { x, _ := strconv.ParseInt(s, 10, 64); return x } func (i *Iost) GetNextInt64() int64 { return i.Atoi64(i.Text()) } func (i *Iost) Atof64(s string) float64 { x, _ := strconv.ParseFloat(s, 64); return x } func (i *Iost) GetNextFloat64() float64 { return i.Atof64(i.Text()) } func (i *Iost) Print(x ...interface{}) { fmt.Fprint(i.Writer, x...) } func (i *Iost) Printf(s string, x ...interface{}) { fmt.Fprintf(i.Writer, s, x...) } func (i *Iost) Println(x ...interface{}) { fmt.Fprintln(i.Writer, x...) } func isLocal() bool { return os.Getenv("I") == "IronMan" } func main() { fp := os.Stdin wfp := os.Stdout if isLocal() { fp, _ = os.Open(os.Getenv("END_GAME")) } iost = NewIost(fp, wfp) defer func() { if isLocal() { iost.Println(recover()) } iost.Writer.Flush() }() solve() for i := 0; isLocal() && i < 100; i++ { iost.Println("-----------------------------------") solve() } } func solve() { n := iost.GetNextInt() m := map[int]int{} aa := make([]int, n) for i := 0; i < n; i++ { aa[i] = iost.GetNextInt() m[aa[i]]++ } score := 0 for i := 0; i < n; i++ { if m[aa[i]-1] == 0 { score += aa[i] } } iost.Println(score) }