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//se citesc de la tastatura numaratorul si numaratorul la 2 fractii pozitive

//sa se calculeze suma si produsul celor 2 fractii, sa se simplifice rezultate optinute, si apoi sa se afiseze

#include<iostream.h>

#include<math.h>

unsigned int cmmdc(unsigned int a, unsigned int b)

{unsigned int r;

while(b)

{r=a%b;

a=b;

b=r;}

return a;}

struct fractie

{int nr,nm;};

fractie f1,f2,fs,fp,fsc;

void main()

{cin>>f1.nr>>f1.nm;

cin>>f2.nr>>f2.nm;

fs.nr=f1.nr*f2.nm+f1.nm*f2.nr;

fs.nm=f1.nm*f2.nm;

fsc.nr=f1.nr*f2.nm-f1.nm*f2.nr;

fsc.nm=f1.nm*f2.nm;

unsigned int x;

x=cmmdc(f2.nr,fs.nm);

fs.nr=fs.nr/x;

fs.nm=fs.nm/x;

cout<<fs.nr<<"/"<<fs.nm;

cout<<fsc.nr<<"/"<<fs.nm;

cout<<endl;

fp.nr=f1.nr*f2.nr;

}