#include <bits/stdc++.h>
using namespace std;
int n, m, p = 0, q = 0, c = 0, d = 0;
int t[1000019];
int main()
{
    ios_base::sync_with_stdio(0);
    cin >> n >> m;
    int mini = n + 1;
    for(int i = 0; i < n; i++)
        cin >> t[i];
    while(q != n - 1)
    {
        if(t[q] == 0)
            d++;
        else
            c++;
        while(d == m)
        {
                p++;
                if(t[p] == 0)
                d--;
                else
                c--;
                mini = min(mini, c);

        }

        q++;
    }
    if(mini == n + 1)
        cout << "NIE";
    else
        cout << mini;
}