#include <iostream>
#include <bits/stdc++.h>
using namespace std;
 
int main() {
    vector<int> arr = {1,0,1,1,0,2};
    int n = arr.size();
    int k = 3;
 
    int l = 0, r = 0;
    int sum = 0;
    int maxlen = 0;
 
    while(r < n) {
        sum += arr[r]; 
 
        while(sum > k && l <= r) {
            sum -= arr[l];
            l++;
        }
 
        if(sum == k) {
            maxlen = max(maxlen, r - l + 1);
        }
 
        r++;
    }
 
    cout << maxlen;
    return 0;
}
 

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