package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
	return scanner
}
func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	cnt := 0
	if os.Getenv("MASPY") == "ますピ" {
		fp, _ = os.Open(os.Getenv("BEET_THE_HARMONY_OF_PERFECT"))
		cnt = 6
	}
	if os.Getenv("MASPYPY") == "ますピッピ" {
		wfp, _ = os.Create(os.Getenv("NGTKANA_IS_GENIUS10"))
	}
	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)
	solve(scanner, writer)
	for i := 0; i < cnt; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
	writer.Flush()
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	aa := make([]int64, 5)
	for i := 0; i < 5; i++ {
		aa[i] = getNextInt64(scanner)
	}
	f := make([]int64, 2)
	f[0] = 1
	f[1] = 1
	for f[len(f)-1]+f[len(f)-2] < int64(1e16+1) {
		f = append(f, f[len(f)-1]+f[len(f)-2])
	}
	ii := make([]int, 6)
	for i := 0; i < 5; i++ {
		ii[i] = index(aa[i], f)
	}
	for i := 4; i >= 0; i-- {
		if ii[i+1] > ii[i] {
			fmt.Fprintln(writer, 4-i)
			return
		}
	}
	fmt.Fprintln(writer, 5)
}
func index(a int64, f []int64) int {
	for i := 0; i < len(f); i++ {
		if f[i] == a {
			return i
		}
	}
	return -1
}