#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n,a[10000]={0},k=0;
    cin>>n;
    if(n==0){
        cout<<'0';
    }
    while(n!=0){
        a[k++]=n%16;
        n/=16;
    }
    for(long long i=k-1;i>=0;i--){
    	if(a[i]>9) cout<<char(a[i]+55);
        else cout<<a[i];
    }
}
/**************************************************************
	Problem: 1289
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/