#include <bits/stdc++.h>
#define rep(i,n) for(int i=0; i<(n); i++)
using namespace std;
typedef long long ll;

int main(){
	int a; cin>>a;
	int t=a*60/100;
	int h=10+t/60;
	int m=t%60;
	if(m/10==0) cout << h << ":0" << m << endl; 
	else cout << h << ":" << m << endl;
}