20
50000000 4
49999999 4
49999998 4
49999997 4
49999996 4
49999995 4
49999994 4
49999993 4
49999992 4
49999991 4
49999990 4
49999989 4
49999988 4
49999987 4
49999986 4
49999985 4
49999984 4
49999983 4
49999982 4
49999981 4
