```cpp
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
double s,v;
int n,h,t,m;
cin>>s>>v;
n=8*60+24*60;
t=ceil(s/v)+10;
n=n-t;
if(n>=24*60)
n-=24*60;
m=n%60;
h=n/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;
}
```
by _Adolf_Hitler_ @ 2023-03-23 10:29:39