#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int n = 600;
  int N;
  cin>>N;
  n += N/10*6;
  cout<<n/60<<':';
  n %= 60;
  if(n < 10) cout<<0<<n<<endl;
  else cout<<n<<endl;
}