package main import ( "bufio" "fmt" "os" "strconv" ) var sc = bufio.NewScanner(os.Stdin) var rdr = bufio.NewReaderSize(os.Stdin, 1000000) func main() { sc.Split(bufio.ScanWords) n := nextInt64() div := int64(10e9 + 7) ns := []int64{1, 2, 2, 3} if n <= 4 { fmt.Println(ns[n-1]) return } n -= 4 for i := int64(0); i < n; i++ { ns[0], ns[1], ns[2], ns[3] = ns[1], ns[2], ns[3], (ns[1]+ns[2])%div } fmt.Println(ns[3]) } func nextLine() string { sc.Scan() return sc.Text() } func nextInt() int { i, _ := strconv.Atoi(nextLine()) return i } func nextInt64() int64 { i, _ := strconv.ParseInt(nextLine(), 10, 64) return i } func nextUint64() uint64 { i, _ := strconv.ParseUint(nextLine(), 10, 64) return i } func nextFloat() float64 { f, _ := strconv.ParseFloat(nextLine(), 64) return f } func readLine() string { buf := make([]byte, 0, 1000000) for { l, p, e := rdr.ReadLine() if e != nil { panic(e) } buf = append(buf, l...) if !p { break } } return string(buf) } func factor(n uint64) []uint64 { if n <= 1 { return []uint64{n} } ps := make([]uint64, 0, 100) for i := uint64(2); i*i <= n; i++ { for n%i == 0 { n /= i ps = append(ps, i) } } if n > 1 { ps = append(ps, n) } return ps } func gcd(a, b uint64) uint64 { for ; b != 0; b, a = a%b, b { } return a } func lcm(a, b uint64) uint64 { return (a * b) / gcd(a, b) }