> #include <cstdio>
> long long X,Y;
> void GCD(long long A,long long B,long long &gcd)
> {
> 	if(B){GCD(B,A%B,gcd);long long t=X;X=Y;Y=t-(A/B)*Y;}
> 	else {gcd=A;X=1,Y=0;}
> }
> int main()
> {
> 	long long x,y,m,n,B;
> 	while(scanf("%lld%lld%lld%lld%lld",&x,&y,&m,&n,&B)!=EOF)
> 	{
> 		long long A=n-m,C=x-y,gcd;
> 		GCD(A,B,gcd);
> 		if(C%gcd) printf("Impossible\n");
> 		else
> 		{
> 			X*=C/gcd;
> 			Y*=C/gcd;
> 			if(X>0)X%=B;
> 			else X=X%B+B;
> 			printf("%lld\n",X);
> 		}
> 	}
> 	return 0;
> }