#include<iostream>

using namespace std;
int main()
{
	int n, x, sum=0, j, min=1001;
	cin >> n >> x;
	int* arr = new int[n];
	for (int i = 0; i < n; i++)
		cin >> arr[i];
	for (int i = 0; i < n; i++)
	{
		sum = 0;
		j = i;
		while (sum <= x)
		{

			sum += arr[j];
			if ((j - i + 1 < min) && sum >= x)
				min = j - i + 1;
			if (j == n)
				break;
			j++;

		}
	}
	if (min == 1001)
	{
		cout << -1;
		return 0;
	}
	cout << min;
}