There are n psychos standing in a line. Each psycho is assigned a unique integer from 1 to n. At each step every psycho who has an id greater than the psycho to his right (if exists) kills his right neighbor in the line. Note that a psycho might kill and get killed at the same step. 

You're given the initial arrangement of the psychos in the line. Calculate how many steps are needed to the moment of time such, that nobody kills his neighbor after that moment. Look notes to understand the statement more precise.

Input

The first line of input contains integer n denoting the number of psychos, (1 ≤ n ≤ 105). In the second line there will be a list of n space separated distinct integers each in range 1 to n, inclusive — ids of the psychos in the line from left to right.

Output

Print the number of steps, so that the line remains the same afterward.

Examples

Input

10
10 9 7 8 6 5 3 4 2 1


Output

2


Input

6
1 2 3 4 5 6


Output

0

Note

In the first sample line of the psychos transforms as follows: [10 9 7 8 6 5 3 4 2 1]  →  [10 8 4] →  [10]. So, there are two steps.
		
		
			import java.io.*;
		import java.math.BigInteger;
		import java.util.*;
			
			
			public class Practice {
				private static InputStream stream;
				private static byte[] buf = new byte[1024];
				private static int curChar;
				private static int numChars;
				private static SpaceCharFilter filter;
				private static PrintWriter pw;
				private static long mod=1000000007;
			
			    public static void main(String[] args) {
			    	InputReader(System.in);
					pw = new PrintWriter(System.out); 
			        new Thread(null ,new Runnable(){
			           public void run(){
			               try{
			                   solve();//This is solution method
		               pw.close();
		           } catch(Exception e){
		               e.printStackTrace();
		           }
		       }
		   },"1",1<<26).start();
			    				   }
			    				    static long sort(int a[])
			        		    	{  int n=a.length;
			        		    		int b[]=new int[n];	
			        		    		return mergeSort(a,b,0,n-1);}
			        		    	static long mergeSort(int a[],int b[],long left,long right)
			        		    	{ long c=0;if(left<right)
			        		    	 {   long mid=left+(right-left)/2;
			        		    		 c= mergeSort(a,b,left,mid);
			        		    		 c+=mergeSort(a,b,mid+1,right);
			        		    		 c+=merge(a,b,left,mid+1,right); }	
			        		    		return c;	 }
			        		    	static long merge(int a[],int  b[],long left,long mid,long right)
			        		    	{long c=0;int i=(int)left;int j=(int)mid; int k=(int)left;
			        		    	while(i<=(int)mid-1&&j<=(int)right)
			        		    	{ if(a[i]>a[j]) {b[k++]=a[i++]; }
			        		    	else	{ b[k++]=a[j++];c+=mid-i;}}
			        		    	while (i <= (int)mid - 1)   b[k++] = a[i++]; 
			        		    	while (j <= (int)right) b[k++] = a[j++];
			        		    	for (i=(int)left; i <= (int)right; i++) 
			        		    		a[i] = b[i];  return c;  }
			        		    		    
			    				    
	    				    
	        		    	public static void solve() {
	        		    	
	        		    		int n=nextInt();
	        		    		
	        		    		 int a[] = nextIntArray(n);
	        		    	     int turn[] = new int[n];

	        		    	        Stack<Integer> s = new Stack();
	        		    	        s.push(0);
	        		    	        turn[0] = -1;  
	        		    	        int ans = 0;
	        		    	        for(int i = 1; i < n; i++){
	        		    	            while(!s.empty() && a[s.peek()] < a[i]) {
	        		    	                turn[i] = Math.max(turn[i], turn[s.peek()]+1);
	        		    	                s.pop();
	        		    	            }

	        		    	            if(s.empty()){
	        		    	                turn[i] = -1;
	        		    	            }
	        		    	            ans = Math.max(ans, turn[i]+1);
	        		    	            s.push(i);
	        		    	        }

	        		    	        	pw.println(ans);
	        		    	}
        		    		
		        		    		
		        		    				
		        		        
		public static boolean isVowel(char c){        		    		
			if(c=='a' || c=='i'|| c=='e' || c=='o' || c=='u')
					return true;
				return false;
			}
			
			public static long trailingZeroes(long n) {
			    long count = 0;
		
			    while (n > 0) {
			        n /= 5;
			        count += n;
			    }
		
			    return count;
			}
		
		    public static int largestPrimeFactor(long number) {
		        int i;
		
		        for (i = 2; i <= number; i++) {
		            if (number % i == 0) {
		                number /= i;
		                i--;
		            }
		        }
		
		        return i;
		}
		   
			
		    public static String reverseString(String s) {
				StringBuilder sb = new StringBuilder(s);
				sb.reverse();
				return (sb.toString());
			}
		    private static BigInteger ncr(int n,int k){
		    	if (k < 0 || k > n) return BigInteger.ZERO;
		        if (n-k < k) k = n-k;
		
		        BigInteger x = BigInteger.ONE;
		        for (int i = 1; i <= k; i++) {
		            x = x.multiply(new BigInteger(""+(n-i+1)));
		x = x.divide(new BigInteger(""+i));
		        }
		
		return x;
		    }
		    static long fact[];
		private static void factmod(int n,int mod){
			fact=new long[n+1];
			fact[0]=1;
			for(int i=1;i<=n;i++){
				fact[i]=i*fact[i-1];
				//fact[i]%=mod;
		
			}
			
		}
		private static long phi(long n){
			long ans=n;
			if(n%2==0)
				ans-=(ans/2);
			while(n%2==0)
			{
				n/=2;
				
			}
			for(int i=3;i*i<=n;i+=2){
				if(n%i==0){
				while(n%i==0){
					n/=i;
				}
				ans-=(ans/i);
				}
			}
			if(n>2)
				ans-=(ans/n);
			
			return ans;
		}
		static long d,x,y;
		static long modInverse(long A, long M)
		{
		extendedEuclid(A,M);
		return (x%M+M)%M;    //x may be negative
		}
		static void extendedEuclid(long A, long B) {
		if(B == 0) {
		d = A;
		x = 1;
		y = 0;
		}
		else {
		extendedEuclid(B, A%B);
		long temp = x;
		x = y;
		y = temp - (A/B)*y;
		}
		}
		static boolean prime[];
		static int spf[];
		public static void sieve(int n){
			prime=new boolean[n+1];
			spf=new int[n+1];
			
			Arrays.fill(spf, 1);
			Arrays.fill(prime, true);
		prime[1]=false;
			spf[2]=2;
			for(int i=4;i<=n;i+=2)
			{
				spf[i]=2;
				prime[i]=false;
			}
		
		for(int i=3;i<=n;i+=2){
			if(prime[i]){
				spf[i]=i;
				for(int j=2*i;j<=n;j+=i){
					
					prime[j]=false;
				if(spf[j]==1){
					spf[j]=i;
				}
				}
			}
		}
			
		}
		public static boolean isPrime(long n) {
			
			if (n <= 1)
				return false;
			if (n <= 3)
				return true;
		
			if (n % 2 == 0 || n % 3 == 0)
				return false;
		
			for (long i = 5; i * i <= n; i = i + 6)
				if (n % i == 0 || n % (i + 2) == 0)
					return false;
		
			return true;
		}
		
		    public static long pow(long n, long p,long mod) {
				if(p==0)
					return 1;
				if(p==1)
					return n%mod;
				if(p%2==0){
					long temp=pow(n, p/2,mod);
				return (temp*temp)%mod;
				}else{
					 	long temp=pow(n,p/2,mod);
					 	temp=(temp*temp)%mod;
					 	return(temp*n)%mod;
					 	
				}
			}
			public static long gcd(long x, long y) {
				if (x == 0)
					return y;
				else
					return gcd( y % x,x);
			}
			
			
			public static void InputReader(InputStream stream1) {
				stream = stream1;
			}
		 
			private static boolean isWhitespace(int c) {
				return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
			}
		 
			private static boolean isEndOfLine(int c) {
				return c == '\n' || c == '\r' || c == -1;
			}
		 
			private static 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++];
			}
		 
			private static 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;
			}
		 
			private static long nextLong() {
				int c = read();
				while (isSpaceChar(c))
					c = read();
				int sgn = 1;
				if (c == '-') {
			sgn = -1;
			c = read();
		}
		long res = 0;
		do {
			if (c < '0' || c > '9')
			throw new InputMismatchException();
		res *= 10;
		res += c - '0';
					c = read();
				} while (!isSpaceChar(c));
				return res * sgn;
			}
		 
			private static String nextToken() {
				int c = read();
				while (isSpaceChar(c))
					c = read();
				StringBuilder res = new StringBuilder();
				do {
					res.appendCodePoint(c);
					c = read();
				} while (!isSpaceChar(c));
				return res.toString();
			}
		 
			private static String nextLine() {
				int c = read();
				while (isSpaceChar(c))
					c = read();
				StringBuilder res = new StringBuilder();
				do {
					res.appendCodePoint(c);
					c = read();
				} while (!isEndOfLine(c));
				return res.toString();
			}
		 
			private static int[] nextIntArray(int n) {
				int[] arr = new int[n];
				for (int i = 0; i < n; i++) {
					arr[i] = nextInt();
				}
				return arr;
			}
		 
			private static int[][] next2dArray(int n, int m) {
				int[][] arr = new int[n][m];
				for (int i = 0; i < n; i++) {
					for (int j = 0; j < m; j++) {
						arr[i][j] = nextInt();
					}
				}
				return arr;
			}
			private static char[][] nextCharArray(int n,int m){
				char [][]c=new char[n][m];
				for(int i=0;i<n;i++){
					String s=nextLine();
					for(int j=0;j<s.length();j++){
						c[i][j]=s.charAt(j);
					}
				}
				return c;
			}
		 
			private static long[] nextLongArray(int n) {
				long[] arr = new long[n];
				for (int i = 0; i < n; i++) {
					arr[i] = nextLong();
				}
				return arr;
			}
		 
			private static void pArray(int[] arr) {
				for (int i = 0; i < arr.length; i++) {
					pw.print(arr[i] + " ");
				}
				pw.println();
				return;
			}
		 
			private static void pArray(long[] arr) {
				for (int i = 0; i < arr.length; i++) {
					pw.print(arr[i] + " ");
				}
				pw.println();
				return;
			}
		 
			private static void pArray(boolean[] arr) {
				for (int i = 0; i < arr.length; i++) {
					pw.print(arr[i] + " ");
				}
				pw.println();
				return;
			}
		 
			private static boolean isSpaceChar(int c) {
				if (filter != null)
					return filter.isSpaceChar(c);
				return isWhitespace(c);
			}
		 
			private interface SpaceCharFilter {
				public boolean isSpaceChar(int ch);
			}
		
			
		}	
		
	/*class Pair implements Comparable<Pair>{
		
			
			int  bea,pri;
			Pair(int bea,int pri){
			
				this.bea=bea;
				this.pri=pri;
				
			}
			@Override
			public int compareTo(Pair o) {
		
				return 0;
				//return (int)(o.size-size);
			}
			public int hashCode() {
					//int hu = (int) (x ^ (x >>> 32));
					//int hv = (int) (y ^ (y >>> 32));
					//int hw = (int) (mass ^ (mass >>> 32));
					//return 31 * hu + hv ;
				return 0;
				}
				public boolean equals(Object o) {
					Pair other = (Pair) o;
				//	return x == other.x && y == other.y;
				return false;
				}
		}
		*/
