#include<bits/stdc++.h>
using namespace std;
int main(){
	int s;
	int v;
	int H,M;
	cin>>s>>v;
	int time;
	time=ceil(s/v)+10;
	int n=(24+8)*60;
    n=n-time;
    if(n>=24*60){
    	n-=24*60;
	}
	if(H<10){
		if(M<10){
			cout<<"0"<<H<<";0"<<M;
		}else{
			cout<<"0"<<H<<";"<<M;
		}
	}else{
		if(M<10){
			cout<<H<<";0"<<M;
		}else{
		    cout<<H<<";"<<M;
		}
	}
	return 0;
}