This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
const int limit = (1e9) + 7;
int n, k;
cin >> n >> k;
k--;
int i = n-1;
int r = 1;
while (i >= 0) {
if (k % 2 == 1) {
assert(i < 60);
r = (r + ((1 << i) % limit)) % limit;
}
k /= 2;
i--;
}
cout << r % limit << "\n";
}
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