#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
string word;
while (cin >> word)
{
int word_lenth = word.size();
int temp=0;
int n = 0;
for (int i = 2; i < word_lenth; i++)
{
if ((word[i] >= 'A') && (word[i] <= 'F'))
{
n = word[i] - 'A' + 10;;
}
if ((word[i] >= '0') && (word[i] <= '9'))
{
n = word[i]-'0' ;
}
temp = temp * 16 + n;//最重要的一步
}
cout << temp << endl;
}
return 0;
}