#include<bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
	if(a%b == 0){
		return b;
	}
	return gcd(b,a%b);
}
int c,d,e,f;
int main()
{
	cin >> c >> d >> e >> f;
	int n = c*e,m = d*f;
	int gcdd = gcd(max(n,m),min(n,m));
	int ans,ans2;
	ans = m /gcdd;
	ans2 = n / gcdd;
	cout << ans << ans2;
}