#include <bits/stdc++.h>

using namespace std;

#define int long long
#define rep(i, n) for(int (i)=0;(i)<(n);(i)++)
#define rrep(i, n) for(int (i)=((n)-1);(i)>=0;(i)--)
#define itn int
#define miele(v) min_element(v.begin(), v.end())
#define maele(v) max_element(v.begin(), v.end())
#define SUM(v) accumulate(v.begin(), v.end(), 0LL)
#define lb(a, key) lower_bound(a.begin(),a.end(),key)
#define ub(a, key) upper_bound(a.begin(),a.end(),key)
#define COUNT(a, key) count(a.begin(), a.end(), key)
#define BITCOUNT(x) __builtin_popcount(x)
#define pb push_back
#define all(x) (x).begin(),(x).end()
#define F first
#define S second
using P = pair<int, int>;
using WeightedGraph = vector<vector<P>>;
using UnWeightedGraph = vector<vector<int>>;
using Real = long double;
using Point = complex<Real>; //Point and Vector2d is the same!
// p.real() or real(p) -> x軸, p.imag() or imag(p) -> y軸
using Vector2d = complex<Real>;
const int MOD = 1000000007;
const long long INF = 1LL << 60;
const double EPS = 1e-15;
const double PI = 3.14159265358979323846;

template<typename T>
int getIndexOfLowerBound(vector<T> &v, T x) {
    return lower_bound(v.begin(), v.end(), x) - v.begin();
}

template<typename T>
int getIndexOfUpperBound(vector<T> &v, T x) {
    return upper_bound(v.begin(), v.end(), x) - v.begin();
}

template<class T>
inline bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
inline bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

#define repi(itr, ds) for (auto itr = ds.begin(); itr != ds.end(); itr++)

istream &operator>>(istream &is, Point &p) {
    Real a, b;
    is >> a >> b;
    p = Point(a, b);
    return is;
}

template<typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p_var) {
    is >> p_var.first >> p_var.second;
    return is;
}

template<typename T>
istream &operator>>(istream &is, vector<T> &vec) {
    for (T &x : vec) is >> x;
    return is;
}

template<typename T, typename U>
ostream &operator<<(ostream &os, pair<T, U> &pair_var) {
    os << pair_var.first << ' ' << pair_var.second;
    return os;
}

template<typename T>
ostream &operator<<(ostream &os, vector<T> &vec) {
    for (int i = 0; i < vec.size(); i++)
        os << vec[i] << ' ';
    return os;
}

template<typename T, typename U>
ostream &operator<<(ostream &os, vector<pair<T, U>> &vec) {
    for (int i = 0; i < vec.size(); i++)
        os << vec[i] << '\n';
    return os;
}

template<typename T>
ostream &operator<<(ostream &os, vector<vector<T>> &df) {
    for (auto &vec : df) os << vec;
    return os;
}

template<typename T, typename U>
ostream &operator<<(ostream &os, map<T, U> &map_var) {
    repi(itr, map_var) {
        os << *itr << ' ';
        itr++;
        itr--;
    }
    return os;
}

template<typename T>
ostream &operator<<(ostream &os, set<T> &set_var) {
    repi(itr, set_var) {
        os << *itr << ' ';
        itr++;
        itr--;
    }
    return os;
}

void print() { cout << endl; }

template<class Head, class... Tail>
void print(Head &&head, Tail &&... tail) {
    cout << head;
    if (sizeof...(tail) != 0) cout << " ";
    print(forward<Tail>(tail)...);
}

signed main(void) { cin.tie(0); ios::sync_with_stdio(false);
    int L, R; cin>>L>>R;

    vector<int> dp(R + 10); // dp iは、L以上R以下の数のペアでgcdがiになるものの数
    int ans = 0;
    for (int i = R; i >= 2; --i) {
        int tmp = (R/i - (L-1)/i)*(R/i - (L-1)/i);
        int now = i + i;
        while(now <= R) {
            tmp -= dp[now];
            now += i;
        }
        dp[i] = tmp;
    }

    ans = SUM(dp);

    for (int i = L; i <= R; ++i) {
        if(i == 1) continue;
        ans -= R/i*2;
    }

    for (int i = L; i <= R; ++i) {
        if(i == 1) continue;
        ans++;
    }

    print(ans);
}


// Problem: F - +1-1x2
// Contest: AtCoder - AtCoder Beginner Contest 188
// URL: https://atcoder.jp/contests/abc188/tasks/abc188_f
// Memory Limit: 1024 MB
// Time Limit: 2000 ms
// Powered by CP Editor (https://github.com/cpeditor/cpeditor)

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define eb emplace_back
#define F first 
#define S second 
#define FAST ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define sz(a) signed(a.size())
using namespace std;
map<ll,ll> dp,vis;
ll rec(ll x, ll y){
	if(y == 1){
		dp[y] = abs(y-x);
		return dp[y];
	}
	if(vis[y])
	return dp[y];
	vis[y] = 1;
	if(y%2){
		dp[y] = min({abs(y-x),2+rec(x,(y+1)/2),2+rec(x,(y-1)/2)});
	}
	else{
		dp[y] = min(abs(y-x),rec(x,y/2)+1);
	}
	return dp[y];
}
void solve(){
	ll x,y;
	cin >> x >> y;
	ll ans = rec(x,y);
	cout << ans ;
}

int main() {
    FAST;
    ll t=1;
    //cin>>t;
    while(t--) solve();	
    return 0;
}