#include<string>
#include<iostream>
using namespace std;
int main(){
    string str;
    int ans=0;
    while(cin>>str){
        for(int i=0;i<str.size();i++){
           if(str[i]>='A'&&str[i]<='Z'){
               ans=ans*16+(str[i]-'A')+10;
           }else if(str[i]>='0'&&str[i]<='9'){
               ans=ans*16+(str[i]-'0');
           }
        }
        printf("%d\n",ans);
        ans=0;
    }
    return 0;
}

#include<string>
#include<iostream>
using namespace std;
int main(){
    int str;
    while(cin>>hex>>str){
        cout<<str<<endl;
    }
    return 0;
}