long long conv(long long a)
{long i,p,result;
for(i=0,p=10;(a%p/10)!=a||i==1;p*=10,i++)
	{
	if(a%10==1)
		{
		result+=pow(2,i);
		}
a/=10;
	}
	printf("%lld",result);
return result;
}


int main()
{long long x;
	FILE *in=fopen("dane.txt","rt"), *out=fopen("wyniki.txt","wt");
	while(feof(in)==0)
	{fscanf(in,"%lld",&x);
	x=conv(x);
	fprintf(out,"%lld",x);
	}
	return 0;
}