#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,k=1,s=0;
	cin>>n;
	while(n!=0){
		s+=n%10*k;
		k*=2;
		if(k==8) {
			k=k/8*10;	
		}
		n/=10;
	}
	cout<<s;
return 0;}

/**************************************************************
	Problem: 1293
	User: fzy001
	Language: C++
	Result: Wrong Answer
****************************************************************/