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("NICKEL") == "BACK" } func main() { fp := os.Stdin wfp := os.Stdout if isLocal() { fp, _ = os.Open(os.Getenv("WELL_EVERYBODY_LIES_TOO_MUCH")) } iost = NewIost(fp, wfp) defer func() { iost.Writer.Flush() }() solve() } func solve() { p := iost.GetNextInt() n := p + 1 pp := make([]int, n) pp[0] = 1 dp := make([][2][2][3]int, n+1) dp[n][0][0][0] = 1 var ans int for i := n - 1; i >= 0; i-- { for j := 0; j < 2; j++ { for k := 0; k < 2; k++ { for l := 0; l < 3; l++ { for d := 0; d < 10; d++ { tj := 0 if pp[i]-j < d { tj = 1 } tk := k if d == 3 { tk = 1 } tl := (l + d) % 3 dp[i][tj][tk][tl] += dp[i+1][j][k][l] if d == 0 { continue } if tk == 0 && tl > 0 { continue } if i > 0 || tj == 0 { ans += dp[i+1][j][k][l] } } } } } } iost.Println(ans) }