m3o7o2n1 @ 2024-02-03 19:46:34
#include <stdio.h>
int main(){
int s,v,min,h,hmin,smin;
scanf("%d %d",&s,&v);
hmin=ceil(s/v)+10;
smin=480+24*60-hmin;
if(smin>=24*60)smin-=24*60;
h=smin/60;
min=smin%60;
if(h<10){
if(min<10)printf("0%d:0%d",h,min);
else printf("0%d:%d",h,min);
}
else{
if(min<10)printf("%d:0%d",h,min);
else printf("%d:%d",h,min);
}
return 0;
}