podniz

#include <iostream>

using namespace std;

int main()
{
    int i,n,j,k,l,br=0,r=0,Ok=1;
    cin >> n;
    int a[n];
    for(i=0;i<n;i++)
        cin >> a[i];
    for(i=2;i<=n;i = i+2)
    {
        for(j=0;j<n-i+1;j++)
        {
            for(k=0;k<i-1;k++)
            {
                for(l=0;(l<i);l++)
                {
                    if(l!=k)
                        if(a[j+k]==a[j+l])
                            br++;
                }
                if(br%2 != 1)
                {
                    Ok=0;
                    break;
                }
                br = 0;
            }
            if(Ok)
                r++;
            br = 0;
            Ok = 1;
        }
    }
    cout << r;
    return 0;
}