#include<iostream>

using namespace std;

int change(char x) {
	if (x >= '0' && x <= '9') return x - '0';
	else return x - 'A' + 10;
}

int main() {
	
	string s;
	while (cin >> s) {
		int ans = 0;
		for (int i = 2; i < s.size(); i ++ ) {
			ans = ans * 16 + change(s[i]);
		}
		cout << ans << endl;
	}
	return 0;
}