#include <iostream>
#include <stdio.h>
#include <list>
using namespace std;
char p[2];
//char Exchange(int number)
//功能：将輸入的數字轉為對應的十六進制字元
char Exchange(int number)
{
if(number < 10)
{
sprintf(p,"%d",number);//将int型資料寫入p字元串中
return p[0];
}
else
{
switch(number)
{
case 10:return 'A';
case 11:return 'B';
case 12:return 'C';
case 13:return 'D';
case 14:return 'E';
case 15:return 'F';
}
}
}
int main()
{
list<char>exp;
unsigned int num;//記錄待轉化的數
//unsigned int 0 ~ 4294967295
cin>>num;
if(num == 0)//輸入為0的情況
{
cout<<num<<endl;
}
else//輸入大于0的情況
{
int re;//記錄餘值
while(num > 0)
{
re = num%16;
exp.push_front(Exchange(re));
num /= 16;
}
int size = exp.size();
while(size--)//輸出
{
cout<<exp.front();
exp.pop_front();
}
}
return 0;
}