#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll=long long;
int main(){
    int a;
    cin>>a;
    a*=6;
    a/=10;
    int x,y;
    x=a/60;
    y=a%60;
    printf("%02d:%02d\n",10+x,y);
}