#include<bits/stdc++.h>
using namespace std;
int main()
{
char st[100];
long int a,i,j,ans,sum;
while(scanf("%s",st))
{
sum=0;
j=strlen(st);
for(i=0;i<j;i++)
{
a=st[i]-'0';
ans=a*(pow(2,j-i)-1);
sum+=ans;
}
if(sum==0) break;
cout<<sum<<endl;
}
return 0;
}
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