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