#include <iostream>
using namespace std;


int main()
{
	int x,y,m,n,L,stepnum=0;
	int state[210];
	cin>>x>>y>>m>>n>>L;

	while(1)
	{
		if(x == y)
		{
			cout<<stepnum<<endl;
			return 0;
		}

		
		if(y > x)
		{	
			if(state[y - x]==1)
			{
				cout<<"Impossible"<<endl;
				return 0;
			}else
			state[y - x] = 1;
		}
		else
		{
			if (state[L + (x - y)]==1)
			{
				cout<<"Impossible"<<endl;
				return 0;
			}else
				state[L + (x - y)] = 1;
		}
		x = (x+m)%L;
		y = (y+n)%L;
		stepnum++;
	}
	
	return 0;
}

#############################################################
POJ伤不起啊，错了都不知道哪里错