> #include<stdio.h>
> void main()
> {
>      unsigned long int  i,x,y,m,n,l,t,g;
> 	 scanf("%u%u%u%u%u",&x,&y,&m,&n,&l);
>      t=(x+m)%l;
>      g=(y+n)%l;
> 	 for(i=1;;)
> 	 {  
> 			if(t==x&&g==y)
>             {
> 				printf("Impossible\n");
> 				break;
> 			}
>             else
> 			{
> 				if(t==g)
> 				{   
> 			        printf("%u\n",i);
> 		            break;
> 				}
> 		        else
> 				{
> 					t=(t+m)%l;
>                     g=(g+n)%l;
> 		     	    i++;
> 			       continue;
> 				}
> 			}
> 	}
> }