#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n, t;
  cin >> n >> t;
  for (int i = 1; i <= n; i++) {
    int val;
    cin >> val;
    t -= (86400 - val);
    if (t <= 0) {
      cout << i << "\n";
      return;
    }
  }
}
int main() {
  solve();
  return 0;
}
