package main import ( "bufio" "fmt" "os" "strconv" ) func gcd(a, b int) int { if a < b { a, b = b, a } for b > 0 { a, b = b, a%b } return a } type segmentTree struct { data []int offset int } func newSegmentTree(n int) segmentTree { var result segmentTree t := 1 for t < n { t *= 2 } result.offset = t - 1 result.data = make([]int, 2*t-1) return result } func (st segmentTree) updateAll(a []int) { for i, v := range a { st.data[st.offset+i] = v } for i := st.offset - 1; i > -1; i-- { st.data[i] = gcd(st.data[i*2+1], st.data[i*2+2]) } } func (st segmentTree) update(index, value int) { i := st.offset + index st.data[i] = value for i >= 1 { i = (i - 1) / 2 st.data[i] = gcd(st.data[i*2+1], st.data[i*2+2]) } } func (st segmentTree) query(start, stop int) int { result := 0 l := start + st.offset r := stop + st.offset for l < r { if l&1 == 0 { result = gcd(result, st.data[l]) } if r&1 == 0 { result = gcd(result, st.data[r-1]) } l = l / 2 r = (r - 1) / 2 } return result } func main() { defer flush() N := readInt() A := make([]int, N) for i := 0; i < N; i++ { A[i] = readInt() } st := newSegmentTree(N) st.updateAll(A) result := 0 j := 1 for i := 0; i < N; i++ { v := st.query(i, j) for v != 1 && j < N { v = gcd(v, A[j]) j++ } if v != 1 { break } result += N - j + 1 } println(result) } const ( ioBufferSize = 1 * 1024 * 1024 // 1 MB ) var stdinScanner = func() *bufio.Scanner { result := bufio.NewScanner(os.Stdin) result.Buffer(make([]byte, ioBufferSize), ioBufferSize) result.Split(bufio.ScanWords) return result }() func readString() string { stdinScanner.Scan() return stdinScanner.Text() } func readInt() int { result, err := strconv.Atoi(readString()) if err != nil { panic(err) } return result } func readInts(n int) []int { result := make([]int, n) for i := 0; i < n; i++ { result[i] = readInt() } return result } var stdoutWriter = bufio.NewWriter(os.Stdout) func flush() { stdoutWriter.Flush() } func printf(f string, args ...interface{}) (int, error) { return fmt.Fprintf(stdoutWriter, f, args...) } func println(args ...interface{}) (int, error) { return fmt.Fprintln(stdoutWriter, args...) }