#include <bits/stdc++.h>
#define int long long
#define chmin(x, v) x = min(x, v)
#define chmax(x, v) x = max(x, v)
#define all(v) v.begin(), v.end()
using namespace std;
const int MOD = 1e9 + 7, N = 1e6 + 5;
int puissance[N];
signed main(){
puissance[0] = 1;
for (int expo = 1; expo < N; ++expo) puissance[expo] = (puissance[expo - 1] * 2)%MOD;
int nBits, val, sum = 1;
cin >> nBits >> val;
val--;
for (int iBit = 0; iBit < nBits; ++iBit){
if (val%2 == 1) sum = (sum + puissance[nBits - 1 - iBit])%MOD;
val /= 2;
}
cout << (sum + MOD)%MOD<< endl;
return 0;
}
