#include <bits/stdc++.h>
/*
author: aykhn
4/24/2023
*/
using namespace std;
typedef long long ll;
#define OPT ios_base::sync_with_stdio(0); \
cin.tie(0); \
cout.tie(0)
#define pii pair<int,int>
#define pll pair<ll,ll>
#define all(v) v.begin(), v.end()
#define mpr make_pair
#define pb push_back
#define ts to_string
#define fi first
#define se second
#define inf 0x3F3F3F3F
#define infll 0x3F3F3F3F3F3F3F3FLL
#define bpc __builtin_popcount
#define print(v) for(int i = 0; i < v.size(); i++) cout << v[i] << " "; cout<<endl;
const ll mod = 1000000007;
ll n, k;
int main()
{
OPT;
cin >> n >> k;
k--;
vector<ll> power(n+1, 0);
power[0] = 1;
for (int i = 1; i <= n; i++) power[i] = (power[i - 1] * 2) % mod;
ll res = 1;
for (int i = 0; i <= min(n, 62 * 1LL); i++)
{
if (k & (1LL << i))
{
res = (res + power[n - i - 1]) % mod;
}
}
cout << res << endl;
}
