#include <bits/stdc++.h>
#define mod 1000000007
using namespace std;
int exp(int b, int e){
    int rez = 1;
    while(e){
        if(e & 1) rez = (1LL * rez * b) % mod;
        e >>= 1;
        b = (1LL * b * b) % mod;
    }
    return rez;
}
int main()
{
    int n,t,i,rez = 0;
    long long k;
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n;
    cin >> k;
    k--;
    for(i = 0; (1LL << i) <= k; i++){
        if(k & (1LL << i))
            rez = (rez + exp(2, n - i - 1)) % mod;
    }
    cout << (rez + 1) % mod;
    return 0;
}