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#include<iostream>
#include<string>
using namespace std;
int main()
{
 string s;
 while(cin>>s)
 {
 int leth=s.length();
 long long sum=0;
 for(int i=0;i<leth;i++)
 {
 if(s[i]>='A'&&s[i]<='F')
 {
 sum=sum*16+s[i]-'A'+10;
 // cout<<sum<<endl;
 }
 else
 {
 sum=sum*16+s[i]-'0';
 //cout<<sum<<endl;
 }
 }
 cout<<sum<<endl;
 }
 return 0;
}