package main

import (
    "fmt"
)

type Solution struct {
    N int
}

func (s Solution) countWays() int {
    prefix := 0
    ans := 0
    for i:=1; i<=s.N; i++ {
        ans = prefix + 1
        prefix+=ans
    }
    return ans
}

func main() {
    n := 0
    fmt.Scan(&n)
    fmt.Print(Solution{N:n}.countWays())
}