#include<iostream>
#include<algorithm>
#include<cstring>

typedef long long LL;
using namespace std;


LL exgcd(LL a,LL b,LL &x,LL &y)
{
    if(!b)
    {
        x=1,y=0;
        return a;
    }
    LL d=exgcd(b,a%b,y,x);
    y-=a/b*x;

    return d;
}
int main()
{
    LL a,b,m,n,L;
    cin>>a>>b>>m>>n>>L;

    LL x,y;
    LL d=exgcd(m-n,L,x,y);
    if((b-a)%d)puts("Impossible");
    else
    {
        x*=(b-a)/d;
        LL t=abs(L/d);
        cout<<(x%t+t)%t<<endl;
    }
}