#include<map>
#include<set>
#include<list>
#include<cmath>
#include<queue>
#include<stack>
#include<vector>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define se second
#define mp make_pair
#define pb push_back
#define pi acos(-1.0)
#define ll long long
#define mod 1000000007
#define C 0.5772156649
#define ls l,m,rt<<1
#define rs m+1,r,rt<<1|1
#define pil pair<int,ll>
#define pii pair<int,int>
#define ull unsigned long long
#define base 1000000000000000000
#define fio ios::sync_with_stdio(false);cin.tie(0)

using namespace std;

;
+,maxn=+,inf=0x3f3f3f3f;

ll gcd(ll a,ll b)
{
    return b?gcd(b,a%b):a;
}
ll exgcd(ll a,ll b,ll &x,ll &y)
{
    if(!b)
    {
        x=,y=;
        return a;
    }
    ll ans=exgcd(b,a%b,x,y);
    ll t=x;x=y;y=t-a/b*y;
    return ans;
}
int main()
{
    ll x,y,n,m,l,a,b;
    scanf("%lld%lld%lld%lld%lld",&x,&y,&m,&n,&l);
    if(m<n)swap(x,y),swap(m,n);
    ll r=gcd(m-n,l);
    )*puts("Impossible");
    exgcd(m-n,l,a,b);
    a*=(y-x)/r;
    a=(a%l+l)%l;
    printf("%lld\n",a);
    ;
}
/********************

********************/