#include<bits/stdc++.h>
using namespace std;
string s,t;
int c;
int main(){
    cin>>s;
    if(s.size()%4==1)s="000"+s;
    else if(s.size()%4==2)s="00"+s;
     else if(s.size()%4==3)s="0"+s;
    for(int i=0;i<s.size();i=i+4){
    	t=s.substr(i,4);
    	c=(t[0]-'0')*4+(t[1]-'0')*2+(t[2]-'0')*1;
    	cout<<c;
    }
}

/**************************************************************
	Problem: 1294
	User: zhujiayi
	Language: C++
	Result: Wrong Answer
****************************************************************/