#include using namespace std; int main() { int n,k,m,p,x,y,z,t,nre7,nre8,a,b; cin>>n>>k>>m>>p; a=nre7=n*k; b=nre8=m*p; while(a!=b) if(a>b)a=a-b; else b=b-a; t=a; y=nre7/t; z=nre8/t; x=y+z; cout<