#include <bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
const int MAX = 3e5 + 6;
const int LOG = 26;
const int inf = 1e18;
const int mod = 1e9 + 7;
const int block = 320;
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int pow(int x){
int cnt = 0;
while(x > 1){
x /= 2;
cnt++;
}
return cnt;
}
int binpow(int a, int b){
int res = 1;
while(b != 0){
if(b % 2 == 1){
res *= a;
res %= mod;
}
a *= a;
a %= mod;
b /= 2;
}
return res;
}
void _(){
int n, k;
cin >> n >> k;
vector < int > cur;
for(int i = 0; i <= 60; i++)
cur.push_back(pow(2, i));
int tot = 0;
while(k > 1){
int ans;
for(int i = 0; i <= 60; i++){
if(cur[i] >= k) break;
ans = cur[i];
}
int power = pow(ans);
// cout << tot << '-';
int x = binpow(2, n - power - 1) % mod;
// cout << n - power - 1 << ' ' << x << endl;
tot = (tot + x) % mod;
k -= ans;
}
cout << (tot + 1) % mod << endl;
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int t = 1;
// cin >> t;
while(t--) _();
}
