#include<stdio.h>
typedef struct {
	int x;
	int y;
}rational;
int cmmdc(int numar1, int numar2)
{
	while (numar1 != numar2)
	{
		if (numar1 > numar2)
			numar1 = numar1 - numar2;
		else numar2 = numar2 - numar1;
	}
	return numar1;
}
int adunare(rational fr1, rational fr2)
{
	rational suma;
	suma.x= fr1.x*fr2.y + fr1.y*fr2.x;
	suma.y = fr1.y*fr2.y;
	while (cmmdc(suma.x, suma.y) != 0)
	{
		int CMMDC = cmmdc(suma.x, suma.y);
		suma.x = suma.x / CMMDC;
		suma.y = suma.y / CMMDC;
	}
	return suma;
}


int scadere(rational fr1, rational fr2)
{
	rational dif;
	dif.x= fr1.x*fr2.y + fr1.y*fr2.x;
	dif.y= fr1.y*fr2.y;
	while (cmmdc(dif.x, dif.y) != 0)
	{
		int CMMDC = cmmdc(dif.x, dif.y);
		dif.x = dif.x / CMMDC;
		dif.y = dif.y / CMMDC;
	}
	return dif;
}
int inmultireNumarator(rational fr1, rational fr2)
{
	return fr1.x*fr2.x;
}
int inmultireNumitor(rational fr1, rational fr2)
{
	return fr1.y*fr2.y;
}
int impartireNumarator(rational fr1, rational fr2)
{
	return fr1.x*fr2.y;
}
int impartireNumitor(rational fr1, rational fr2)
{
	return fr1.y*fr2.x;
}
void main()
{
	rational fr1, fr2;
	scanf("%d %d %d %d",&fr1.x,&fr1.y,&fr2.x,&fr2.y)
}