Problem:
Score : 400 points

Problem Statement

Caracal is fighting with a monster.

The health of the monster is H.

Caracal can attack by choosing one monster. When a monster is attacked, depending on that monster's health, the following happens:

If the monster's health is 1, it drops to 0.

If the monster's health, X, is greater than 1, that monster disappears. Then, two new monsters appear, each with the health of \lfloor X/2 \rfloor.

(\lfloor r \rfloor denotes the greatest integer not exceeding r.)

Caracal wins when the healths of all existing monsters become 0 or below.

Find the minimum number of attacks Caracal needs to make before winning.

Constraints

1 \leq H \leq 10^{12}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

H

Output

Find the minimum number of attacks Caracal needs to make before winning.

Sample Input 1

2

Sample Output 1

3

When Caracal attacks the initial monster, it disappears, and two monsters appear, each with the health of 1.

Then, Caracal can attack each of these new monsters once and win with a total of three attacks.

Sample Input 2

4

Sample Output 2

7

Sample Input 3

1000000000000

Sample Output 3

1099511627775

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef double db;
typedef vector<ll> VI;
typedef vector<pair<ll,ll> > VII;
typedef map<ll,ll> mll;
typedef pair<ll,ll> pll;
//
#define M 1000000007
#define INF (ll)0x3f3f3f3f3f3f3f3f
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define F first
#define S second
#define itr iterator
#define GO ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
void fileioe(){
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout); 
	freopen("error.txt","w",stderr);
}

void error_out() { cerr << endl; }
template <typename Head, typename... Tail>
void error_out(Head H, Tail... T) {
  cerr << " " << H;
  error_out(T...);
}
void time_elapsed(){
  cerr<<"\nTime Elapsed : " << 1.0*clock() / CLOCKS_PER_SEC << " s\n";
}
#ifndef ONLINE_JUDGE
#define error(...) cerr << "[" << #__VA_ARGS__ << "]:", error_out(__VA_ARGS__)
#define fioe() fileioe()
#define time() time_elapsed()
#else
#define error(...) 1
#define fioe() 1
#define time() 1
#endif
ll ways(ll h){
	if(h==1){
		return 1;
	}
	ll small=ways(h/2);
	return 2*small+1;
}
//
int main()
{
	GO
	//fioe();
	ll h;
	cin>>h;
	cout<<ways(h)<<endl;
	time();
	return 0;
}