2
1 18
 9
6 20 27 28 40 53 59 70 85
 8
10 20 30 40 50 60 70 80
 6
13 17 32 47 60 66
 1
1
 8
5 17 20 35 42 53 67 76
 1
90
 6
14 29 43 59 70 74
 76
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
 8
15 20 30 40 50 60 73 83
 14
14 22 27 31 35 44 46 61 62 69 74 79 88 89
 30
6 11 12 15 22 24 30 31 32 33 34 35 40 42 44 45 47 50 53 54 57 58 63 67 75 77 79 81 83 88
 84
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
 6
15 30 45 60 74 89
 9
15 28 39 48 55 60 63 64 74
 1
15
 9
10 20 30 40 50 60 70 80 84
 25
1 2 3 4 5 6 7 8 9 10 11 23 36 50 65 81 82 83 84 85 86 87 88 89 90
 5
15 30 45 60 74
 2
16 50
 12
14 22 27 31 35 44 62 69 74 79 88 89
 10
15 28 39 48 55 60 63 64 74 82
 60
1 2 4 5 6 7 11 14 16 18 20 21 22 23 24 25 26 33 34 35 36 37 38 39 41 42 43 44 46 47 48 49 52 55 56 57 58 59 60 61 63 64 65 67 68 70 71 72 73 74 75 77 78 80 82 83 84 85 86 88
 6
15 30 45 60 75 84
 90
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
 3
1 20 90
 8
1 16 30 31 32 33 34 50
 72
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
 12
1 3 6 10 15 21 28 36 45 55 66 78
 1
16
 5
15 30 45 60 75

16
 90
 90
 81
 16
 90
 15
 58
 90
 90
 90
 90
 90
 90
 89
 30
 90
 80
 89
 15
 59
 90
 90
 90
 90
 16
 49
 54
 90
 15
 90

import java.io.*;
import java.util.*;

public class A {

    void solve() throws IOException {
        in = new InputReader("__std");
        out = new OutputWriter("__std");

        int n = in.readInt();
        int prev = 0;
        while (n-- > 0) {
            int cur = in.readInt();
            if (cur - prev > 15) {
                out.println(prev + 15);
                exit();
            }
            prev = cur;
        }

        out.println(90);
        exit();
    }

    void exit() {
        //System.err.println((System.currentTimeMillis() - startTime) + " ms");
        out.close();
        System.exit(0);
    }

    InputReader in;
    OutputWriter out;

    //long startTime = System.currentTimeMillis();

    public static void main(String[] args) throws IOException {
        new A().solve();
    }

    class InputReader {

        private InputStream stream;

        private byte[] buffer = new byte[1024];
        private int pos, len;

        private int cur;

        private StringBuilder sb = new StringBuilder(32);

        InputReader(String name) throws IOException {
            if (name.equals("__std")) {
                stream = System.in;
            } else {
                stream = new FileInputStream(name);
            }
            cur = read();
        }

        private int read() throws IOException {
            if (len == -1) {
                throw new EOFException();
            }
            if (pos >= len) {
                pos = 0;
                len = stream.read(buffer);
                if (len == -1) return -1;
            }
            return buffer[pos++];
        }

        private boolean whitespace() {
            return cur == ' ' || cur == '\t' || cur == '\r' || cur == '\n' || cur == -1;
        }

        char readChar() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            char res = (char) cur;
            cur = read();
            return res;
        }

        int readInt() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            while (whitespace()) {
                cur = read();
            }
            if (cur == -1) {
                throw new EOFException();
            }
            int sign = 1;
            if (cur == '-') {
                sign = -1;
                cur = read();
            }
            int res = 0;
            while (!whitespace()) {
                if (cur < '0' || cur > '9') {
                    throw new NumberFormatException();
                }
                res *= 10;
                res += cur - '0';
                cur = read();
            }
            return res * sign;
        }

        long readLong() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            return Long.parseLong(readToken());
        }

        double readDouble() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            return Double.parseDouble(readToken());
        }

        String readLine() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            sb.setLength(0);
            while (cur != -1 && cur != '\r' && cur != '\n') {
                sb.append((char) cur);
                cur = read();
            }
            if (cur == '\r') {
                cur = read();
            }
            if (cur == '\n') {
                cur = read();
            }
            return sb.toString();
        }

        String readToken() throws IOException {
            if (cur == -1) {
                throw new EOFException();
            }
            while (whitespace()) {
                cur = read();
            }
            if (cur == -1) {
                throw new EOFException();
            }
            sb.setLength(0);
            while (!whitespace()) {
                sb.append((char) cur);
                cur = read();
            }
            return sb.toString();
        }

        boolean eof() {
            return cur == -1;
        }
    }

    class OutputWriter {

        private PrintWriter writer;

        OutputWriter(String name) throws IOException {
            if (name.equals("__std")) {
                writer = new PrintWriter(System.out);
            } else {
                writer = new PrintWriter(name);
            }
        }

        void print(String format, Object ... args) {
            writer.print(new Formatter(Locale.US).format(format, args));
        }

        void println(String format, Object ... args) {
            writer.println(new Formatter(Locale.US).format(format, args));
        }

        void print(Object value) {
            writer.print(value);
        }

        void println(Object value) {
            writer.println(value);
        }

        void println() {
            writer.println();
        }

        void flush() {
            writer.flush();
        }

        void close() {
            writer.close();
        }
    }
}
