import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

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

    static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BShiftOnly solver = new BShiftOnly();
        solver.solve(1, in, out);
        out.close();
    }

    static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BShiftOnly solver = new BShiftOnly();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BShiftOnly solver = new BShiftOnly();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) BShiftOnly solver = new BShiftOnly(); solver new BShiftOnly() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    } BShiftOnly public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        } solve {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        } int n = Integer.parseInt(in.next()); n Integer.parseInt(in.next()) Integer.parseInt Integer in.next() in.next in int bit = 0; bit 0 for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
                bit = bit | in.nextInt();
            } {
                bit = bit | in.nextInt();
            } bit = bit | in.nextInt() bit bit | in.nextInt() bit in.nextInt() in.nextInt in out.println(Integer.numberOfTrailingZeros(bit)) out.println out Integer.numberOfTrailingZeros(bit) Integer.numberOfTrailingZeros Integer bit int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BShiftOnly solver = new BShiftOnly();
        solver.solve(1, in, out);
        out.close();
    }

    static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BShiftOnly solver = new BShiftOnly();
        solver.solve(1, in, out);
        out.close();
    }

    static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

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

    static class BShiftOnly {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int n = Integer.parseInt(in.next());
            int bit = 0;
            for (int i = 0; i < n; i++) {
                bit = bit | in.nextInt();
            }
            out.println(Integer.numberOfTrailingZeros(bit));
        }

    }
}

