```c
#include<iostream>
using namespace std;
int main(){
int s,v,h=8,m,t;
cin>>s>>v;
if(s%v==0)t=s/v;
else if(s%v!=0)t=s/v+1;
t+=10;
if(t%60==0)h=h-t/60;
else h=h-t/60-1;
if(h<0)h=24+h;
if(t%60==0)m=0;
else m=60-t%60;
if(h<10&&m<10)cout<<0<<h<<":"<<0<<m;
else if(h>=10&&m<10)cout<<h<<":"<<0<<m;
else if(h<10&&m>=10)cout<<0<<h<<":"<<m;
else if(h>=10&&m>=10)cout<<h<<":"<<m;
}
```
by HASPID @ 2023-09-22 22:04:07