poj1565

#include<iostream>
#include<fstream>
using namespace std;
int main(){
string num;
//ifstream cin("2.txt");
while(cin>>num&&num!="0"){
int sub_num=0;
int sum=0;
for(int i=0;i<num.length();++i){
int b=num[i]-'0';
sum=sum*2+b;
sub_num+=b;
}
cout<<sum*2-sub_num<<endl;
}
return 0;
}