5
ababa
 8
aaabcabc
 7
abcdabc
 29
abbabbaabbbbaababbababbaabbaa
 5
baaaa
 54
dgafkhlgdhjflkdafgjldjhgkjllfallhsggaaahkaggkhgjgflsdg
 7
abcdbcd
 20
ccbbcbaabcccbabcbcaa
 11
ababcabcabc
 9
azxcvzxcv
 10
wvwlwvwwvw
 11
ababababccc
 7
dabcabc
 6
abcabd
 12
ababababvvvv
 11
jjlkalfhdhh
 6
abbbba
 8
ababcdef
 10
ababcababc
 7
ababbcc
 6
ablfab
 45
bbbbbbbabababbbaabbbbbbbbbbbbabbbabbaabbbabab
 100
mhnzadklojbuumkrxjayikjhwuxihgkinllackcavhjpxlydxcmhnzadklojbuumkrxjayikjhwuxihgkinllackcavhjpxlydxc
 5
aaaaa
 99
lhgjlskfgldjgadhdjjgskgakslflalhjfgfaaalkfdfgdkdffdjkjddfgdhalklhsgslskfdhsfjlhgajlgdfllhlsdhlhadaa
 10
adadadadad
 46
kgadjahfdhjajagdkffsdfjjlsksklgkshfjkjdajkddlj
 7
aabcdaa
 1
s
 4
ttob
 16
abcdabcdabcdabcd
 1
a
 37
lglfddsjhhaagkakadffkllkaagdaagdfdahg
 7
aabaaaa
 12
abaabaabaaba
 27
aaaaaaaaaaaaaaaaaaaaaaaaaaa
 17
abcdefggggglelsoe
 32
bbbbaaabbaabbaabbabaaabaabaabaab
 9
abbbbabbb
 10
asdasdasda
 10
bbbbbbbbbc
 11
abcabcabcab
 20
aabaabaabaabaabaabaa
 8
abcabcde
 6
abcaca
 7
aabcabc
 100
yeywsnxcwslfyiqbbeoaawtmioksfdndptxxcwzfmrpcixjbzvicijofjrbcvzaedglifuoczgjlqylddnsvsjfmfsccxbdveqgu
 16
bbbbbbaaaaaaaaaa
 77
babbaababaabbaaaabbaababbbabaaaabbabaaaaaaaabbbaaabbabbbabaababbabaabbbbaaabb
 8
aaaaaaaa
 6
ababab
 3
lsl
 12
wwvwwvwwvwwv
 10
ababababab
 8
ffffffff
 10
abcdeeeeee
 8
abbbbbba
 16
uuuuuuuuuuuuuuuu
 9
baaaabaaa
 7
zabcabc
 6
aaaaaa
 8
abcdeabc
 12
ababababbbbb
 14
abcdefgabcdepq
 6
ajkoaj
 3
aaa
 81
aaaaaababaabaaaabaaaaaaaabbabbbbbabaabaabbaaaababaabaababbbabbaababababbbbbabbaaa
 8
abcdefef
 8
abbababa
 9
abcdeabcd
 14
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 8
acacacac
 86
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 11
abcdeabcdfg
 38
asdsssdssjajghslfhjdfdhhdggdsdfsfajfas
 10
bbbbbbbaaa
 8
baaaaaaa
 5
abcbc
 8
ababcabc
 66
ldldgjllllsdjgllkfljsgfgjkflakgfsklhdhhallggagdkgdgjggfshagjgkdfld
 92
bbbbbabbbaaaabaaababbbaabbaabaaabbaabababaabbaabaabbbaabbaaabaabbbbaabbbabaaabbbabaaaaabaaaa
 10
abcabcabca
 5
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 12
abcabcabcabc
 8
aaaabcde
 8
abbbbbbb
 10
abcabcdddd
 20
abcdabcdeeeeeeeeabcd
 5
abbbb
 16
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 10
aaaacaaaac
 10
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 7
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 8
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 7
abacbac
 36
bbabbaabbbabbbbbabaaabbabbbabaabbbab
 8
aabcabca
 10
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 8
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 14
aaabcabcabcabc
 79
lsfgfhhhkhklfdffssgffaghjjfkjsssjakglkajdhfkasfdhjhlkhsgsjfgsjghglkdkalaajsfdka
 7
mabcabc
 17
ababababzabababab
 8
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 10
abcdabcefg
 17
abcdefgggggabcdef
 13
eabcdefabcdef
 8
abababab
 28
aaaaaaaaaaaaaaibfprdokxvipsq
 13
aabbbkaakbbbb
 4
abab
 9
zabcdabcd
 70
babababbabababbbabaababbababaabaabbaaabbbbaababaabaabbbbbbaaabaabbbabb
 9
abcabcabc
 2
aa
 100
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
 4
aaaa
 36
babbbbababaaabbabbbaabaabbbbbbbbbbba
 9
asdfgasdf
 13
aabaabaabaabx
 95
bbaaaabaababbbabaaaabababaaaaaabbababbaabbaaabbbaaaabaaaaaaababababbabbbaaaabaabaababbbbbababaa
 5
xabab
 20
hhhhhhhhhhhhhhhhhhhh
 41
abbababbbbbabbbabaaaababaaabaabaaabbbbbbb
 8
pppppppp
 5
abcab
 10
avavavavbc
 12
aaaaaaaaaaaa
 63
jhkjhadlhhsfkadalssaaggdagggfahsakkdllkhldfdskkjssghklkkgsfhsks
 9
aaaaaaaaa
 6
abcbcd
 16
aaaaaaaaaaaaaaaa
 9
asdfpasdf
 12
aabaabaabaab
 74
ghhhfaddfslafhhshjflkjdgksfashhllkggllllsljlfjsjhfggkgjfalgajaldgjfghlhdsh
 39
jflfashaglkahldafjasagasjghjkkjgkgffgkk
 10
adcbeadcfg
 5
cabab
 6
ababbb
 99
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 7
abcaabc
 6
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 87
fhjgjjagajllljffggjjhgfffhfkkaskksaalhksfllgdjsldagshhlhhgslhjaaffkahlskdagsfasfkgdfjka
 8
baaaaaab
 5
aavaa
 5
aabab

4
 8
 7
 27
 5
 54
 7
 20
 10
 9
 10
 8
 7
 6
 9
 11
 6
 7
 6
 6
 6
 43
 51
 4
 99
 7
 46
 7
 1
 4
 9
 1
 37
 7
 7
 15
 17
 31
 9
 8
 7
 9
 12
 6
 6
 7
 100
 14
 77
 5
 5
 3
 7
 7
 5
 10
 8
 9
 9
 7
 4
 8
 9
 14
 6
 3
 79
 8
 8
 9
 9
 5
 86
 11
 38
 8
 8
 5
 7
 65
 91
 8
 5
 7
 7
 8
 8
 17
 5
 9
 6
 6
 6
 6
 7
 34
 8
 10
 8
 14
 79
 7
 14
 7
 10
 17
 13
 5
 22
 13
 3
 9
 64
 7
 2
 51
 3
 36
 9
 8
 95
 5
 11
 41
 5
 5
 7
 7
 63
 6
 6
 9
 9
 7
 74
 39
 10
 5
 5
 51
 7
 6
 87
 8
 5
 5

import java.io.*;
import java.util.*;
import java.io.IOException;
import java.io.InputStream;

import static java.lang.Math.ceil;
import static java.lang.Math.toDegrees;

public class Main {
    public static void main(String[] args) {

        File file = new File("in.txt");
        File fileOut = new File("out.txt");
        InputStream inputStream = null;
        OutputStream outputStream = null;
        // try {inputStream= new FileInputStream(file);} catch (FileNotFoundException ex){return;};
//        try {outputStream= new FileOutputStream(fileOut);} catch (FileNotFoundException ex){return;};
        inputStream = System.in;
        outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(1, in, out);
        out.close();
    }


}

class Task {
    public void solve(int testNumber, InputReader in, PrintWriter out) {
        int n = in.nextInt();
        String s = in.next();

        Integer bestVal = s.length();

        for(int i=1; i<s.length(); i++){
            if(isPrefix(i,s)){
                bestVal = Math.min(bestVal, s.length() - i + 1);
            }
        }

        out.println(bestVal);



    }

    public Boolean isPrefix(Integer pos, String s){
        if(s.length()< (pos) * 2){
            return Boolean.FALSE;
        }

        for(int i=0; i<pos; i++){
            if(s.charAt(i) != s.charAt(i+pos)){
                return Boolean.FALSE;
            }
        }
        return Boolean.TRUE;
    }

}


class InputReader {
    public BufferedReader reader;
    public StringTokenizer tokenizer;

    public InputReader(InputStream stream) {
        reader = new BufferedReader(new InputStreamReader(stream), 32768);
        tokenizer = null;
    }

    public String next() {
        while (tokenizer == null || !tokenizer.hasMoreTokens()) {
            try {
                tokenizer = new StringTokenizer(reader.readLine());
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }
        return tokenizer.nextToken();
    }

    public String nextLine(){
        try {
            return reader.readLine();
        } catch (IOException e){
            throw new RuntimeException(e);
        }
    }

    public int nextInt() {
        return Integer.parseInt(next());
    }
    public long nextLong() { return Long.parseLong(next()); }

}



class Pair<F, S> {
    public final F first;
    public final S second;




    public Pair(F first, S second) {
        this.first = first;
        this.second = second;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Pair)) {
            return false;
        }
        Pair<?, ?> p = (Pair<?, ?>) o;
        return Objects.equals(p.first, first) && Objects.equals(p.second, second);
    }

    @Override
    public int hashCode() {
        return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
    }

    @Override
    public String toString() {
        return "(" + first + ", " + second + ')';
    }
}

class IntPair extends Pair<Integer, Integer>{
    public IntPair(Integer first, Integer second){
        super(first, second);
    }
}

class LPair extends Pair<Long, Long>{
    public LPair(Long first, Long second){
        super(first, second);
    }
}