#include <vector>
#include <algorithm>
#include <iostream>
#include <set>
#include <cmath>
#include <map>
#include <random>
#include <cassert>
#include <ctime>
#include <cstdlib>
#include <queue>
#include <limits.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int N; cin >> N;
vector<int> arr(N); for (int i = 0; i < N; i++) cin >> arr[i];
vector<int> pref = {0}; for (int i = 0; i < N; i++) pref.push_back(pref.back() + arr[i]);
int P; cin >> P;
int c = 0;
for (int r = 0; r < N; r++) {
for (int l = 0; l <= r; l++) {
if (pref[r + 1] - P * r - P >= pref[l] -P * l) {
c++;
}
}
}
cout << c;
}
