#include <iostream>
#include <string>
#include <cstdio>

using namespace std;

string toHexString(int n);

int main() {

    int n;
    cin >> n;

    string hexStr = toHexString(n);
    cout << hexStr << endl;

    return 0;
}

string toHexString(int n) {
    // write your code here......
    char m[10]={0};
    sprintf(m, "%X",n);
    return m;

}