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#include<bits/stdc++.h>
using namespace std;
int main() {
long a;//输入的数
int y=0;//循环中的余数
string s="";//输出的结果
cin>>a;
if(a==0) { //0比较特殊，单独处理
cout<<0;
return 0;
}
while(a>0) { //大于0的数
y=a%16; //求余
if(y<10) //小于10的余数
s=char('0'+y)+s; //利用字符的ascll码在字符串前面拼接
else
s=char('A'-10+y)+s; //大于9的余数用ABCDE表示
a=a/16;
cout<<s;
