#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;
#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second
const int MOD = 1000000007;
int expo(int a, int b){
int res=1;
for (;b;a=(a*a)%MOD, b>>=1)if (b&1)res=(res*a)%MOD;
return res;
}
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, k, ans=0;
cin>>n>>k, --k;
for (int i=0; i<64; ++i)if (k&(1ll<<i))ans=(ans+expo(2, n-i-1))%MOD;
cout<<ans+1;
}
