#include <iostream>

using namespace std;

int main() {
  int n;
  int64_t p;
  cin >> n >> p;
  for(int i = 1; i <= n; i++) {
    int64_t curr;
    cin >> curr;
    if((p+i-1)/i < curr) {
      cout << (i-1) << "\n";
      return 0;
    }
    p -= curr;
  }
  cout << n << "\n";
}