#include "bits/stdc++.h" using namespace std; int main() { int D; cin >> D; string s1, s2; cin >> s1 >> s2; s1 += s2; int ans = D; int cnt2 = 0; s1 = "xxxxxxxxxxxxxxxxxxxx" + s1 + "xxxxxxxxxxxxxxxxxxxxxx"; for (int i = 0; i < s1.size(); i++) { if (s1[i] == 'o'){ cnt2++; ans = max(cnt2, ans); } else cnt2 = 0; } if (D == 0){ cout << ans << endl; return 0; } for (int j = 0; j < s1.size(); j++) { int tempans = 0; int cnt = 0; tempans = cnt; for (int i = 0; i < s1.size(); i++) { /* if (((i - j) >= 0 && (i - j) < D)){ if (s1[i] == 'o'){ //tempans = -10000; //break; cnt++; tempans = max(tempans, cnt); } else{ cnt++; tempans = max(tempans, cnt); } } else if (s1[i] == 'o'){ cnt++; tempans = max(tempans, cnt); } else cnt = 0; */ if ((((i - j) >= 0 && (i - j) < D)) || s1[i] == 'o'){ cnt++; tempans = max(tempans, cnt); } else cnt = 0; } if (tempans < 0) continue; tempans = max(cnt, tempans); ans = max(ans, tempans); } //ans = min(ans, 14); cout << ans << endl; cin >> ans; }