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

int main(){
	int sum = 0;   //十进制
	string str;
	
	while( cin >> str ){
		int sum = 0;   //十进制，必须放在内循环里，每次重置
	    for( int i=2; i < str.size(); i++ ){
	        if( str[i] >= '0' && str[i] <= '9' )
			    sum = sum * 16 + str[i] - '0';
		    else
			    sum = sum * 16 + str[i] - 'A' + 10;
	    }
	    cout << sum << endl;
	}
	
    return 0;
}