> #include <iostream>
> using namespace std;
> long gcd(long m,long n,long l);
> int main()
> {
> 	long x,y,m,n,l;
> 	cin>>x>>y>>m>>n>>l;
> 	long q;
> 	if(y>x)q=y-x;
> 	else q=x-y;
> 	if(m==n||q%gcd(m,n,l)!=0)
> 		cout<<"Impossible";
> 	long a,b,c;
> 	a=m-n;c=y-x;
> 	long long k;
> 	for(b=1;b<l;b++)
> 	{
> 		k=a*b-c;
> 		if(k%l==0)
> 		{cout<<b;break;}
> 	}
> 	return 0;
> }
> long gcd(long m,long n,long l)
> {
> 	long k;
> 	if(m-n<0)k=n-m;
> 	else k=m-n;
> 	long a,b;
> 	if(k>=l){a=k;b=l;}
> 	else {a=l;b=k;}
> 	long q,r;
> 	do
> 	{	
> 		q=a/b;r=a%b;
> 		a=b;b=r;
> 	}while(r!=0);
> 	return a;
> }