#include<iostream.h>
struct rational
{ int nr,nu;
}x,y,s;
void main()
{ int a,b;
cin>>x.nr>>x.nu;
cin>>y.nr>>y.nu;
s.nr=x.nr*y.nu+x.nu*y.nr;
s.nu=x.nu*y.nu;
a=s.nr;
b=s.nu;
while(a!=b)
if(a>b) a=a-b;
else b=b-a;
s.nr=s.nr/a;
s.nu=s.nu/a;
cout<<s.nr<<"/"<<s.nu;
}
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