#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int MOD = 1e9 + 7;
const ll LOG = 31;
#define db(x) cerr << #x << " = " << x << " | "
#define dbg(x) cerr << #x << " = " << x << "\n"
#define Algerian ios::sync_with_stdio(0);
#define OI cin.tie(NULL);
ll binexp(ll b, ll e) {
ll res = 1;
while (e > 0) {
if (e & 1) res = (res * b) % MOD;
e >>= 1;
b = (b * b) % MOD;
}
return res;
}
int main() {
Algerian OI
ll n, k;
cin >> n >> k;
--k;
ll res = 0;
while (n > 0) {
if (k & 1) {
res = (res + binexp(2, n - 1)) % MOD;
}
k >>= 1;
n--;
}
cout << (res + 1) % MOD << "\n";
return 0;
}
