#include<bits/stdc++.h>
using namespace std;
int n,m,a[100000],i; 
int main(){
	cin >> n;
    while (n){
	    a[++i]=n%16;
	    n/=16;
    }
    cout << "0x";
    for(int j=i; j>=1; j--){
	    if(a[j]<10) cout << a[j];
	    else cout << char(a[j]-10+'A');
    }	
	return 0;
}