s,v = map(int,input().split(' ')) t = s/v +10 htime = int(t//60+1) mtime = int(60-t%60) if htime>8: h0=htime-8 h1=24-h0 else: h1=8-htime if h1 < 10: if mtime < 10: print("0%d:0%d" % (h1,mtime)) else: print("0%d:%d" % (h1,mtime)) else: if b < 10: print("%d:0%d" % (h1,mtime)) else: print("%d:%d" % (h1,mtime))

源代码就是上面那些，我试了500和20的输入就会显示语法错误（可能就是bug或bug之一），怎么处理啊?