杭电ACM2051

#include<iostream>
using namespace std;
int main(){
	int n,arr[500],count=0;
	while(cin>>n){
		for (int i=0;n!=0;i++){
			arr[i]=n%2;
			n=n/2;
			count=i;}
		for (int i=count; i>=0;i--)cout<<arr[i];
		cout<<endl;}
		return 0;}