#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll>pairll;
typedef pair<ll,ull>pairull;
typedef pair<ll,pairll>pair3l;
typedef long double ld;
typedef pair<ld,ll>pairld;
#define fr first
#define sc second
#define pb push_back
#define endl '\n'
#define N 100007
#define MOD 1000000007
#define INF 1000000000000000007
#define eps 0.0000000001
ll n,k,res,d[10*N];
int main(){
cin>>n>>k;
d[0]=1;
for(int i=1;i<n;i++){
d[i]=(d[i-1]*2)%MOD;
}
n--;
while(k>1){
if(k%2==0)res=(res+d[n])%MOD;
n--;
k=(k+1)/2;
}
cout<<(res+1)%MOD<<endl;
return 0;
}
