Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh: mm. However, he hates waking up, so he wants to make waking up less painful by setting the alarm at a lucky time. He will then press the snooze button every x minutes until hh: mm is reached, and only then he will wake up. He wants to know what is the smallest number of times he needs to press the snooze button.

A time is considered lucky if it contains a digit '7'. For example, 13: 07 and 17: 27 are lucky, while 00: 48 and 21: 34 are not lucky.

Note that it is not necessary that the time set for the alarm and the wake-up time are on the same day. It is guaranteed that there is a lucky time Jamie can set so that he can wake at hh: mm.

Formally, find the smallest possible non-negative integer y such that the time representation of the time x·y minutes before hh: mm contains the digit '7'.

Jamie uses 24-hours clock, so after 23: 59 comes 00: 00.

Input

The first line contains a single integer x (1 ≤ x ≤ 60).

The second line contains two two-digit integers, hh and mm (00 ≤ hh ≤ 23, 00 ≤ mm ≤ 59).

Output

Print the minimum number of times he needs to press the button.

Examples

Input

3
11 23


Output

2


Input

5
01 07


Output

0

Note

In the first sample, Jamie needs to wake up at 11:23. So, he can set his alarm at 11:17. He would press the snooze button when the alarm rings at 11:17 and at 11:20.

In the second sample, Jamie can set his alarm at exactly at 01:07 which is lucky.
import java.io.*;

public class P916A {
    private static class HpReader {
        private BufferedReader in;

        public HpReader(String dir, String inFile, String outFile) {
            initAndRedirectInOut(dir, inFile, outFile);
        }

        private int ivl(String val) {
            return Integer.parseInt(val);
        }

        private long lvl(String val) {
            return Long.parseLong(val);
        }

        private void initAndRedirectInOut(String dir, String inFile, String outFile) {
            if (dir != null) {
                try {
                    String containingDirPath = dir.endsWith(File.separator) ? dir : dir + File.separator;
                    if (isDebug && inFile != null) System.setIn(new FileInputStream(new File(containingDirPath + inFile)));
                    if (isDebug && outFile != null) System.setOut(new PrintStream(new File(containingDirPath + outFile)));
                } catch (FileNotFoundException e) {
                    // Do nothing, stdin & stdout are not redirected
                }
            }
            in = new BufferedReader(new InputStreamReader(System.in));
            out = new PrintWriter(System.out);
        }

        private String nextSingleStr() throws IOException {
            return in.readLine();
        }

        private String[] nextLineStr() throws IOException {
            return nextLineStr(0);
        }

        private String[] nextLineStr(int offset) throws IOException {
            String[] inp = nextSingleStr().split(" ");
            String[] rs = new String[offset + inp.length];
            System.arraycopy(inp, 0, rs, offset, inp.length);
            return rs;
        }

        private int nextSingleInt() throws IOException {
            return ivl(in.readLine());
        }

        private int[] nextLineInt() throws IOException {
            return nextLineInt(0);
        }

        private int[] nextLineInt(int offset) throws IOException {
            String[] inp = nextLineStr();
            int[] rs = new int[offset + inp.length];
            for (int i = 0; i < inp.length; i++) rs[offset + i] = ivl(inp[i]);
            return rs;
        }

        private long nextSingleLong() throws IOException {
            return lvl(in.readLine());
        }

        private long[] nextLineLong() throws IOException {
            return nextLineLong(0);
        }

        private long[] nextLineLong(int offset) throws IOException {
            String[] inp = nextLineStr();
            long[] rs = new long[offset + inp.length];
            for (int i = 0; i < inp.length; i++) rs[offset + i] = lvl(inp[i]);
            return rs;
        }

        private int[][] nextMatInt(int lineCount) throws IOException {
            return nextMatInt(lineCount, 0, 0);
        }

        private int[][] nextMatInt(int lineCount, int rowOffset, int colOffset) throws IOException {
            int[][] rs = new int[rowOffset + lineCount][];
            for (int i = rowOffset; i < rs.length; i++) rs[i] = nextLineInt(colOffset);
            return rs;
        }
    }

    private static class HpHelper {
        private static final String LOCAL_DEBUG_FLAG = "COM_PROG_DEBUG";

        private static boolean isDebug() {
            try {
                return Boolean.parseBoolean(System.getenv(HpHelper.LOCAL_DEBUG_FLAG));
            } catch (Exception e) {
                return false;
            }
        }

        private static String createDelimiter(String delimiter) {
            return delimiter == null ? " " : delimiter;
        }

        private static void println(int[] data, String delimiter) {
            delimiter = createDelimiter(delimiter);
            for (int t : data) out.print(t + delimiter);
            out.println();
        }

        private static void println(long[] data, String delimiter) {
            delimiter = createDelimiter(delimiter);
            for (long t : data) out.print(t + delimiter);
            out.println();
        }

        private static <T> void println(T[] data, String delimiter) {
            delimiter = createDelimiter(delimiter);
            for (T t : data) {
                if (t instanceof int[]) {
                    println((int[]) t, delimiter);
                } else if (t instanceof long[]) {
                    println((long[]) t, delimiter);
                } else if (t instanceof Object[]) {
                    println((Object[]) t, delimiter);
                } else {
                    out.print(t + delimiter);
                }
            }
            out.println();
        }
    }

    private static boolean isDebug = HpHelper.isDebug();
    private static HpReader in = new HpReader("/Users/apple/Work/WorkSpaces/CompetitiveProg/", "in.txt", null);
    private static PrintWriter out;

    private static boolean isLucky(int h, int m) {
        return ("" + h + m).contains("7");
    }

    public static void main(String[] args) throws IOException {
        int x = in.nextSingleInt(), inp[] = in.nextLineInt(), h = inp[0], m = inp[1], rs = 0;
        while (true) {
            if (isLucky(h, m)) {
                out.println(rs);
                break;
            }
            if (m >= x) {
                m -= x;
            } else {
                m = (m + 60) - x;
                h -= 1;
                if (h < 0) {
                    h += 24;
                }
            }
            rs += 1;
        }

        out.flush();
    }
}
