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- #include <iostream>
- #include <queue>
- #include <vector>
- using namespace std;
- int main() {
- int n;
- cin >> n;
- int niza[n];
- for(int i = 0; i < n; i++) {
- cin >> niza[i];
- }
- int i = 0, j = 0;
- int cnt_3 = 0;
- int res = 0;
- while(j < n) {
- if(cnt_3 <= 3) {
- if(niza[j] == 3) {
- cnt_3++;
- }
- j++;
- }
- else {
- if(niza[i] == 3) {
- cnt_3--;
- }
- i++;
- }
- if(cnt_3 == 3) {
- res = max(res, j - i);
- }
- }
- cout << res << endl;
- return 0;
- }
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