#include <bits/stdc++.h>
using namespace std;
int main() {
long long int num,i=0;
string ans = "";
char str[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
scanf("%lld",&num);
if(num==0) {
cout<< 0 ;
} else {
while(num) {
ans+=str[num % 16];//n
num /= 16;
}
for (int i = ans.size() - 1; i >= 0; i--) {
cout << ans[i];
}
}
}