#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,popcnt,sse4")
#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>
const ll mxn = 1e6+10;
const ll mod = 1e9+7;
ll N,K;
ll pw[mxn];
ll mad(ll a,ll b){
if(a>mod)a %= mod;
if(b>mod)b %= mod;
a += b;
return a>=mod?a-mod:a;
}
ll mub(ll a,ll b){
return mad(a,mod-b);
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
pw[0] = 1;
for(int i = 1;i<mxn;i++)pw[i] = mad(pw[i-1],pw[i-1]);
cin>>N>>K;
ll ans = 0;
N--;
K--;
ll now = 0;
while(N>60){
now++;N--;
}
while(N>=0){
if((1ll<<N)<=K){
K -= 1ll<<N;
ans = mad(ans,pw[now]);
}
now++;N--;
}
cout<<mad(ans,1)<<'\n';
return 0;
}
