text: #include<bits/stdc++.h>
   
  typedef long  double ll;
  #define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  #define endl "\n"
  #define pb push_back
  #define pl push_right
   
  using namespace std;
   void test(int n){
  	 int res[1000];
  	 int i=0;
  	 while(n>0)
  	 {
  		 res[i]=n/2;
  		 n=n%2;
  		 i++;
  	 }
  	 for(int j=i-1;j>=0;j--)
  	  printf("%d",res[j]);
    }
  		 
  int main() {
  	ios_base::sync_with_stdio(false);
  	cin.tie(nullptr);
  	cout.precision(10);
  	cout<<fixed;
  	test(4);
  return 0;
  }
  