n, lo, hi = read_line.split.map &.to_i64
c = read_line.split.map &.to_i64

ans = (1...1 << n).sum { |mask|
  l = (0...n)
        .select { |i| mask.bit(i) == 1 }
        .to_a.reduce(1_i64) { |acc, i|
          acc.lcm(c[i])
        }

  cnt = hi // l - (lo - 1) // l

  k = mask.popcount.to_i64
  k.odd? ? k*cnt : -k*cnt
}

puts ans