#include <iostream>
#include <sstream>
#include <string>
#include <stdint.h>
using namespace std;
 
 
 
 
 
int main() {
 
	uint64_t x; 
	string in = "fffefffe";
 
    std::stringstream ss;
    ss << std::hex << in;
    cout << ss.str() << endl;
    ss >> x;
    cout << x << endl;
 
    x = x << 2;
     cout << x << endl;
 
     std::ostringstream ss2;
 
    ss2 << std::hex << x;
 
 
    cout << ss2.str() << endl;
 
 
	// your code goes here
	return 0;
}

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