import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}

void main()
{
  int a, b, c, d; readV(a, b, c, d);

  writeln(d < 10 ? "Possible" : "Impossible");
  if (d >= 10) return;

  auto e = 0, s = 0;
  foreach (i; 0..b) {
    ++e;
    s += 50 * 2^^((e-1)/100);
  }
  foreach (i; 0..a) {
    ++e;
    s += 100 * 2^^((e-1)/100);
  }

  writeln(s);
}