hello

#include<iostream>
#include<cmath>
using namespace std;

int main(){
    unsigned long long n, k;
    unsigned long long length = 1;
    cin >> n >> k;
    if (n == 64) length = -1;
    else {
        for (int i = 0;i < n;i++) length *= 2;
        length --;
    }
    for (long long i = 0;i < n;i++){
        if (k <= length / 2){
            cout << 0;
        }
        else{
            cout << 1;
            k = length - k;
        }
        length /= 2;
    }
}