> #include "stdio.h"
> #include "math.h"
> #include "iostream.h"
> 
> int main(int argc, char* argv[])
> {
> 	long x,y,m,n,L;
> 	cin>>x>>y>>m>>n>>L;
> 	if(x==y||x<0||y<0||x>= 2000000000||y>= 2000000000||m>= 2000000000||n>= 2000000000||L>= 2100000000||m<=0||n<=0||L<=0)
> 	{return 0;} 
> 	else
> 	{	
> 		long a,b,c;
> 		a=L;b=n-m;c=x-y;
> 		if(b==0){cout<<"Impossible"<<endl;}
> 		else{
> 		long A[10000]={0};
> 		long x=a,y=abs(b),d,temp;
> 		long u0,u1,u,v0,v1,v;
> 		int i=0,j=2;
> 		while(y!=0)
> 		{
> 			temp=y;
> 			A[i]=x/y;
> 			y=x%y;	
> 			x=temp;
> 			i++;
> 		}
> 		d=temp;
> 		u0=1;u1=A[0];v0=0;v1=1;u=u0+A[1]*u1;v=v0+v1*A[1];
> 		while(j<i-1)
> 		{
> 									
> 			u0=u1;
> 			u1=u;
> 			u=u0+A[j]*u1;
> 			v0=v1;
> 			v1=v;
> 			v=v0+v1*A[j];
> 			j++;
> 		}
> 		if(c%d!=0) cout<<"Impossible"<<endl;
> 		else
> 		{
> 			int e=(a*v>abs(b)*u)?1:(-1);
> 			int f=(b>0)?1:(-1);
> 			long x0=e*c*v/d,y0=-e*f*c*u/d,y,k=abs(y0)*d/a;
> 			y=(y0>0)?(y0%(a/d)):((k+1)*a/d+y0);
> 			cout<<y<<endl ;
> 		}
> 		}
> 
> 	}
>    
> 	return 0;
> }