1 #include <iostream>
 2 using namespace std;
 3 char change(int x)
 4 {
 5     if(x>=0&&x<=9) return x-0+'0';
 6     else if(x>=10&&x<=15) return x-10+'A';
 7 }
 8 char a[10];
 9 int main()
10 {
11     long long n;
12     while(cin>>n){
13         int i=0;
14         while(n>=16){
15             int x=n%16;
16             a[i]=change(x);
17             n/=16;
18             i++;    
19         }
20         a[i]=change(n);
21         for(int j=i;j>=0;j--){
22             cout<<a[j];
23         }
24         cout<<endl;
25     }
26     return 0;
27 }