#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
#define ld long double
const ll N = 100+5 , INF = 1e18 , MOD = 1e9+7;
void solve(){
ll n;
cin >> n;
vector<ll> a(n+5) , sum(n+5);
for(ll i = 1; i <= n; i++){
cin >> a[i];
sum[i] = sum[i-1]+a[i];
}
ll p;
cin >> p;
ll ans = 0;
for(ll j = 1; j <= n; j++){
for(ll i = 1; i <= j; i++){
if(sum[j]-p*j >= sum[i-1]-p*(i-1)) ans++;
}
}
cout << ans;
}
int main(){
fast;
ll tc = 1;
// cin >> tc;
while(tc--) solve();
return 0;
}