#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
long long binExp(long long x, long long n) {
  long long r = 1;
  while (n > 0) {
    if (n % 2 == 1) r = r * x;
    x = x * x;
    n = n / 2;
  }
  return r;
}
long long modbinExp(long long x, long long n, long long M) {
  long long r = 1;
  while (n > 0) {
    if (n % 2 == 1) r = (r * x) % M;
    x = (x * x) % M;
    n = n / 2;
  }
  return r;
}
void solve() {
  long long n;
  cin >> n;
  string s;
  cin >> s;
  long long ans = 0;
  for (long long l = 0; l <= n / 2; l++) {
    if (s.substr(0, l) == s.substr(l, l)) ans = max(ans, l);
  }
  cout << ans + (n - 2 * ans) + (ans ? 1 : 0);
}
int main() {
  ios_base::sync_with_stdio(false);
  long long t;
  t = 1;
  while (t--) {
    solve();
  }
}
