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

signed main() {
int A;
cin >> A;

A = A/10*6;

int B = 10 + A/60;
int C = A%60;

if( C < 10 ){
cout << B << ":0" << C << endl;
}else{
cout << B << ":" << C << endl;
}




}