#include <bits/stdc++.h>
using namespace std;

signed main(){
  int a;cin>>a;
  a/=10;
  int h=10,m=0;
  m+=6*a;
  h+=m/60;
  m%=60;
  h%=24;
  if(h<10)cout<<0;
  cout<<h<<":";
  if(m<10)cout<<0;
  cout<<m<<endl;
}