POJ 1565

#include <iostream>
#include <string.h>
using namespace std;
typedef unsigned int uint;
uint de(char* x){
    uint n=1,r=0;
    char *p;
    for(p=x;*p;++p);
    for(--p;p>=x;--p)r+=((n<<=1)-1)*(*p-'0');
    return r;
}
int main(){
    for(char x[1024];cin>>x;cout<<de(x)<<endl)
        if(!strcmp(x,"0"))break;
    return 0;
}