#include<iostream> using namespace std; int main(){ int x; cin>>x; int hh,mm,ss; hh=s/(60*60); mm=(s-hh*（60*60）)/60； ss=s-hh*(60*60)-mm*60; if(hh<10) cout<<"0"; cout<<hh<<":"; if(mm<10) cout<<"0"; cout<<hh<<":"; if(ss<10) cout<<"0"; cout<<hh<<":"; return 0; }