here is my code



#include<stdio.h>
#include<stdlib.h>


int main()
{


    int n,a[150],i,j,c[150]={0},s=0,r;


scanf("%d",&n);



    for(i=0;i<n;i++)
    {

    scanf("%d",&a[i]);

                    }

  for(i=0;i<n;i++)
  {
                  for(j=i;j<n;j++)
                  {
                                    if(a[i]==a[j])
                                    {
                                    c[i]++;
                                    }
                                    }
                                    }


  for(i=0;i<n;i++)
  {
        r=c[i]/4;
         s=s+r;

        }

    if(n==c[0])
    {
    printf("%d\n",c[0]/4);
}
else
{
       printf("%d\n",s);
}






    return 0;



}