#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int N = 1e6 + 10;
int t, n, m, k, l, r, op, x, y;
string str;
bool flag ;
void solve() {
    while (cin >> str) {
        flag = false;
        if (str[0] == '-') {
            str.erase(str.begin());
            flag = true;
        }
        str = "~" + str.substr(2);
        int siz = str.size() - 1;
        int ans = 0;
        for (int i = 1; i <= siz; i++) {
            if(str[i]>='0'&&str[i]<='9'){
                k=str[i]-'0';
            }else if(str[i]>='A'&&str[i]<='Z'){
                k=str[i]-'A'+10;
            }else{
                k=str[i]-'a'+10;
            }
            ans += k * pow(16, siz - i);
        }
        if (flag)cout << "-";
        cout << ans << "\n";
    }
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    solve();
    return 0;
}