#include <bits/stdc++.h>
using namespace std;

void boostear()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

void files()
{
    freopen("input.txt", "r", stdin); // redirects standard input
    freopen("output.txt", "w", stdout); // redirects standard output
}

int main()
{
    boostear();

    int n;
    cin >> n;

    if(n==1)
    {
        cout << 1;
        return 0;
    }
    else if(n==2)
    {
        cout << 0;
        return 0;
    }

    vector<int> c(n);
    for(int i=0; i<n; i++)
        cin >> c[i];

    vector<int> odd(n), even(n);
    even[0]=0;
    if(n>2)
        odd[0]=c[0], odd[1]=odd[0];

    for(int i=2; i<n; i+=2)
        odd[i]=odd[i-1]+c[i], odd[i+1]=odd[i];
    for(int i=1; i<n; i+=2)
        even[i]=even[i-1]+c[i], even[i+1]=even[i];

    int res=0;
    if(odd[n-1]-c[0] == even[n-1])
        res++;
    if(n%2 != 0)
        if(odd[n-1]-c[n-1] == even[n-1])
            res++;
    else if(n%2 == 0)
        if(even[n-1]-c[n-1] == odd[n-1])
            res++;

    for(int i=1; i<n-1; i++)
    {
        int suma1=odd[i-1]+(even[n-1]-even[i]);
        int suma2=even[i-1]+(odd[n-1]-odd[i]);
        if(suma1==suma2)
            res++;
    }

    cout << res;

    return 0;
}