#include
    
     #include
     
      using namespace std;long long exgcd(long long a,long long b,long long &x,long long &y) {if(b==0)  {x=1; y=0; return a;}  long long t=exgcd(b,a%b,y,x);  y-=a/b*x;  return t; }int main() {       long long p,q,m,n,l,x,y,c; scanf("%lld%lld%lld%lld%lld",&p,&q,&m,&n,&l);   c=p-q;          long long d=exgcd(n-m,l,x,y); if(c%d!=0) printf("Impossible"); else   {long long ans=x*(c/d),s=l/d;    printf("%lld",(ans%s+s)%s);   } return 0; }