using namespace std;
int main()
{
unsigned int x,y,m,n,l,t;
cin>>x>>y>>m>>n>>l;
if(m==n)cout<<"Impossible"<<endl;
else 
   {
   unsigned int r1,r2,d_r;
   t=1;
   r1=x+m*t;
   r2=y+n*t;
   r1>r2?(d_r=(r1-r2)):(d_r=(r2-r1));
   for(;d_r%l!=0;r1+=m,r2+=n,t++){
      r1>r2?(d_r=(r1-r2)):(d_r=(r2-r1));
      if((r1%l==x&&r2%l==y)){
      cout<<"Impossible"<<endl;
      m=0;
      break;}
      }       
   if(m!=0)cout<<t-1;
   }
return 0;
}