def min(a,b); a < b ? a : b; end
A,B,C,D = gets.split.map(&:to_i)
if D >= 10
  puts :Impossible
else
  rb,mb = B.divmod(100) 
  ans = rb.times.inject(0){|sum,i| sum + 50 * 100 * (1 << i) }
  mba = min(100 - mb, A) 
  ra,ma = (A - mba).divmod(100)
  ans = ra.times.inject(ans + (1 << rb) * (50 * mb + 100 * mba)){|sum, i| sum + 100 * 100 * (1 << (rb + i + 1)) }
  ans += ma * 100 * (1 << ra + rb + 1)
  
  puts :Possible
  puts ans
end