import java.util.*;


public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    } main {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int x = sc.nextInt(); x sc.nextInt() sc.nextInt sc int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int ans = 102; ans 102 int re = 0; re 0 List<Integer> p = new ArrayList<Integer>(); p new ArrayList<Integer>() for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		} int i =0; int i =0; i 0 i<n i n i++ i++ i {
		    p.add(sc.nextInt());
		} {
		    p.add(sc.nextInt());
		} p.add(sc.nextInt()) p.add p sc.nextInt() sc.nextInt sc for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		} int i=101; int i=101; i 101 i>=0 i 0 i-- i-- i {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		} {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		} if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    } !p.contains(i) p.contains(i) p.contains p i {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    } if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        } ans>=Math.abs(x-i) ans Math.abs(x-i) Math.abs Math x-i x i {
		            ans=Math.abs(x-i);
		            re = i;
		        } ans=Math.abs(x-i) ans Math.abs(x-i) Math.abs Math x-i x i re = i re i System.out.println(re) System.out.println System.out System System.out re String[] args args public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
} public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
} Main
import java.util.*;


public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
}