```c
#include<iostream>
using namespace std;
int main(){
int s,v;
int c,m,n;
cin>>s>>v;
int x=s/v;
if(x<s*1.0/v){
x=x+1;
}
c=(8+24)*60-(10+x);
n=c%60;
m=c/60;
if(m>=24){
m=m-24;
}
printf("%02d:%02d",m,n);
return 0;
}
```
by nemo2010 @ 2022-09-24 08:13:26