import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

void readV(T...)(ref T t){auto r=readln.splitter;foreach(ref v;t){v=r.front.to!(typeof(v));r.popFront;}}

void main()
{
  int a; readV(a);

  auto m = a/10*6;
  writefln("%02d:%02d", 10+m/60, m%60);
}