#include <bits/stdc++.h>
#include <cctype>
using namespace std;

int main() {
    string s;
    cin >> s;
    int ans(0);
    for(int i = 2; i < s.size(); ++i){
        if(isdigit(s[i])){
            ans = ans * 16 + s[i] - '0';
        }
        else {
           ans = ans * 16 + 10 + s[i] - 'A'  ;
        }
    }
    cout << ans << endl;
}