20
50000000 2
49999999 2
49999998 2
49999997 2
49999996 2
49999995 2
49999994 2
49999993 2
49999992 2
49999991 2
49999990 2
49999989 2
49999988 2
49999987 2
49999986 2
49999985 2
49999984 2
49999983 2
49999982 2
49999981 2
