#include <stdio.h>

int main() {
	int x,y,m,n,l,t,i;
	scanf("%d %d %d %d %d",&x,&y,&m,&n,&l);	
	fflush(stdin);
	if(m > n) {
		m = m - n;
		x = (x>y?l-x+y:y-x);
	}
	else {
		m = n - m;
		x = (x<y?l-y+x:x-y);
	} 
	t = 1;
	while(1) {
		i = (m*t)%l;
		if(i == x) {
			printf("%d\n", t);
			break;
		}
		else if(i == 0) {
			printf("Impossible\n");
			break;
		}
		++t;
	}
	return 0;
}