- #include <iostream>
- using namespace std;

- int main(){
	- int s,v,h,m,t;
	- cin >>s >>v;
	- if(s%v){
		- t = s/v + 1;
	- } else{
		- t = s/v;
	- }
	- t = 8*60 - 10 - t;
	- h = t/60;
	- m = t-h*60;
	- cout <<0 <<h <<':';
	- if(m<10){
		- cout <<0;
	- }
	- cout <<m;
	- return 0;
- }