...

#include <iostream>
using namespace std;
int main() {
int n,a[1000001],i=1;
cin>>n;
while(n!=0){
a[i]=n%2;
n/=2;
i++;
}
if(a[i]!=0) cout<<a[i];
for(int j=i-1;j>=1;j--){
cout<<a[j];
}
return 0;
}