#include <bits/stdc++.h>
using namespace std;
int n, m, x, l[100005], ans;
int main () {
    freopen ("lantern.in", "r", stdin);
    freopen ("lantern.out", "w", stdout);
    cin >> n >> m >> x;
    for (int i = 1; i <= n; i++) {
        cin >> l[i];
        l[i] += l[i - 1];
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i; j++) {
            if (l[i] - l[j - 1] >= x && i - j + 1 <= m) {
                if (i == j) ans ++;
                else ans += 2;
            }
        }
    }
    cout << ans;
    return 0;
}
/*
3 2 -4 2 3
5 5
*/