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
aabaa
 12
abcabcabcabc
 8
aaaabcde
 8
abbbbbbb
 10
abcabcdddd
 20
abcdabcdeeeeeeeeabcd
 5
abbbb
 16
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 10
aaaacaaaac
 10
aaaaaaaaaa
 7
abababa
 8
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 7
abacbac
 36
bbabbaabbbabbbbbabaaabbabbbabaabbbab
 8
aabcabca
 10
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 8
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 14
aaabcabcabcabc
 79
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 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
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 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.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.InputMismatchException;
import java.io.IOException;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Pranay2516
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        FastReader in = new FastReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        TaskB solver = new TaskB();
        solver.solve(1, in, out);
        out.close();
    }

    static class TaskB {
        public void solve(int testNumber, FastReader in, PrintWriter out) {
            int n = in.nextInt();
            String s = in.next();
            char c[] = s.toCharArray();
            if (n == 1) {
                out.println(1);
                return;
            }
            String through = s.substring(0, 2);
            int ans = s.length(), maxsim = 0;
            for (int i = 2; i < n; ++i) {
                String forward = "";
                for (int j = i; j < Math.min(2 * i, n); ++j) forward += c[j];
                if (through.equals(forward)) maxsim = Math.max(maxsim, forward.length() - 1);
                through += c[i];
            }
            out.println(ans - maxsim);
        }

    }

    static class FastReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
        private FastReader.SpaceCharFilter filter;

        public FastReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1) throw new InputMismatchException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (numChars <= 0) return -1;
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = read();
            while (isSpaceChar(c)) c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9') throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            while (!isSpaceChar(c));
            return res * sgn;
        }

        public String next() {
            int c = read();
            while (isSpaceChar(c)) c = read();
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = read();
            }
            while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null) return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);

        }

    }
}

