#include <stdio.h>
#include <math.h>
float a[500000],b[500000],n,c[500000];
void citire(){
freopen("trapez.in","r",stdin);
scanf ("%f",&n);
  for (long i=0;i<n;i++)
     scanf("%f %f",&a[i],&b[i]);
fclose(stdin);
}

float max(float a,float b){
  if (a>b)
    return a-b;
    return b-a;
}

long numarere(){
long nr=0;
for (long i=0;i<n-1;i++)
  for (long j=i+1;j<n;j++)
   if (max(b[i],b[j])!=0)
      c[nr++]=max(a[i],a[j])/max(b[i],b[j]);
   else
      c[nr++]=-1;
long S=0;
  for (long y=0;y<nr-1;y++) {
  long aux=0;
     for (long k=y+n;k<nr;k++)
       if (c[y]==c[k])
	  aux++;
     if (aux!=0)
       S+=pow(aux,2);
  }
return S;
}
int main(){
citire();
freopen("trapez.out","w",stdout);
printf("%ld",numarere());
printf("\n");
fclose(stdout);
return 0;
}