#include <iostream>
using namespace std;
int main() {
int a;
int b[100];
char c;
cin >> a;
if(a<=9)
cout << a;
else if(a<36){
c=a+55;
cout << c;
}
else{
int i = 0;
while(a!=0){
b[i] = a%36;
a /=36;
i++;
}
for(int j = i-1;j>=0;j--){
if(b[j]<=9)
cout << b[j];
else{
c = b[j]+55;
cout << c;
}
}
}
}