#include<iostream>
using namespace std;
double power(double x, int n);

int main(int argc, char const *argv[])
{
    int x;
    cin>>x;
    int wei=0;
    int sum=0;
    int each,chu;
    for(int i=0;i<8;i++)
    {
        each=x%10;
        chu=x/10;
        sum+=each*power(2,wei);
        x=chu;
        wei++;
    }
    cout<<sum<<endl;
    system("pause");
    return 0;
}
double power(double x, int n)
{
    double val = 1.0;
    while(n--)
    {
        val*=x;
    }
    return val;
}