package main import ( "bufio" "fmt" "log" "os" "strconv" ) func main() { log.SetFlags(log.Lshortfile) N := nextInt() M := nextInt() P := nextInt() Q := nextInt() mouth := 0 for N > 0 { mouth++ if mouth%12 >= P && mouth%12 < P+Q { N -= M * 2 } else { N -= M } } fmt.Println(mouth) } func max(a ...int) int { r := a[0] for i := 0; i < len(a); i++ { if r < a[i] { r = a[i] } } return r } func min(a ...int) int { r := a[0] for i := 0; i < len(a); i++ { if r > a[i] { r = a[i] } } return r } func sum(a []int) (r int) { for i := range a { r += a[i] } return r } func minmax(a, b int) (int, int) { if a > b { return b, a } return a, b } func abs(a int) int { if a < 0 { return -a } return a } type Pair struct { a, b int } type Pairs []Pair func (p Pairs) Len() int { return len(p) } func (p Pairs) Swap(i, j int) { p[i], p[j] = p[j], p[i] } func (p Pairs) Less(i, j int) bool { return p[i].b < p[j].b } var nextReader func() string func init() { nextReader = NewScanner() } func NewScanner() func() string { r := bufio.NewScanner(os.Stdin) r.Buffer(make([]byte, 1024), int(1e+11)) r.Split(bufio.ScanWords) return func() string { r.Scan() return r.Text() } } func nextString() string { return nextReader() } func nextInt64() int64 { v, _ := strconv.ParseInt(nextReader(), 10, 64) return v } func nextInt() int { v, _ := strconv.Atoi(nextReader()) return v } func nextInts(n int) []int { r := make([]int, n) for i := 0; i < n; i++ { r[i] = nextInt() } return r } func nextFloat64() float64 { f, _ := strconv.ParseFloat(nextReader(), 64) return f }