#include <bits/stdc++.h>
using namespace std;
template <class A>
void pr(A a) {
  cout << a;
  cout << '\n';
}
template <class A, class B>
void pr(A a, B b) {
  cout << a << ' ';
  pr(b);
}
template <class A, class B, class C>
void pr(A a, B b, C c) {
  cout << a << ' ';
  pr(b, c);
}
template <class A, class B, class C, class D>
void pr(A a, B b, C c, D d) {
  cout << a << ' ';
  pr(b, c, d);
}
template <class A>
void PR(A a, long long n) {
  for (long long i = (long long)(0); i < (long long)(n); i++) {
    if (i) cout << ' ';
    cout << a[i];
  }
  cout << '\n';
}
long long check(long long n, long long m, long long x, long long y) {
  return x >= 0 && x < n && y >= 0 && y < m;
}
const long long MAX = 1e9 + 7, MAXL = 1LL << 61, dx[4] = {-1, 0, 1, 0},
                dy[4] = {0, 1, 0, -1};
void Main() {
  long long n, m, k;
  cin >> n >> m >> k;
  long long a[n];
  for (long long i = (long long)(0); i < (long long)(n); i++) cin >> a[i];
  long long l = -1, r = n;
  while (l + 1 < r) {
    long long mm = (l + r) / 2;
    long long c = 0, x = 0;
    for (long long i = (long long)(mm); i < (long long)(n); i++) {
      if (x + a[i] > k) {
        c++;
        x = a[i];
      } else
        x += a[i];
    }
    if (x) c++;
    if (c > m)
      l = mm;
    else
      r = mm;
  }
  pr(n - r);
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  Main();
  return 0;
}
