import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.NoSuchElementException;

class BitVector{
	long[] small;
	int[] big;
	int n;
	
	public BitVector(int n) {
		this.n=n;
		small=new long[n/64+1];
		big=new int[n/64+1];
	}
	
	void set(int k) {
		small[k/64]|=1L<<(k%64);
	}
	
	void build() {
		for(int i=0;i<big.length;++i) {
			big[i]=(i>0?Long.bitCount(small[i-1]):0)+(i>0?big[i-1]:0);
		}
	}
	
	int access(int k) {
		return (int) ((small[k/64]>>>(k%64))&1);
	}
	
	//[l,r)
	int rank(int l,int r,long m) {
		if(l>=r)return 0;
		int ret=bitCount(r)-bitCount(l);
		return m==1?ret:(r-l-ret);
	}
	
	//[0,n)
	int bitCount(int n) {
		n=Math.min(n, this.n);
		if(n<=0)return 0;
		--n;
		return big[n/64]+Long.bitCount((small[n/64]<<(63-n%64))>>>(63-n%64));
	}
}

class WaveletMatrix{
	int w=64;
	BitVector[] b=new BitVector[w];//b[i]:=&2^{i+1}で安定ソートしたときの第&2^{i} 
	int[] nz=new int[w];
	int n;
	final long base=Long.MAX_VALUE/2;
	
	public WaveletMatrix(long[] a) {
		n=a.length;
		for(int i=0;i<b.length;++i)b[i]=new BitVector(n);
		long[][] sorted=new long[n][];
		for(int i=0;i<a.length;++i) {
			sorted[i]= new long[]{a[i]+base,0};
		}
		Comparator<long[]> comp=new Comparator<long[]>() {
			@Override
			public int compare(long[] o1, long[] o2) {
				return Long.compare((o1[0]>>>o1[1])&1, (o2[0]>>>o2[1])&1);
			}
		};
		for(int bit=w-1;bit>=0;--bit) {
			for(int i=0;i<n;++i)sorted[i][1]=bit+1;
			
			if(bit<w-1)Arrays.sort(sorted, comp);//安定ソート
			for(int i=0;i<n;++i)if(((sorted[i][0]>>>bit)&1)==1) {
				b[bit].set(i);
			}
		}
		for(int i=0;i<b.length;++i)b[i].build();
		for(int i=0;i<b.length;++i)nz[i]=b[i].rank(0, n, 0);
	}
	
	long access(int k) {
		long ret=0;
		int pos=k;
		for(int bit=w-1;bit>=0;--bit) {
			int v=b[bit].access(pos);
			ret|=(1L<<bit)*v;
			pos=b[bit].rank(0, pos, v)+(v==0?0:nz[bit]);
		}
		return ret-base;
	}
	
	long quantile(int l,int r,int k) {
		if(k+1>r-l)throw new AssertionError();
		long ret=0;
		for(int bit=w-1;bit>=0;--bit) {
			int nl=-1,nr=-1;
			if(b[bit].rank(l, r, 0)>=k+1) {
				nl=b[bit].rank(0, l, 0);
				nr=nl+b[bit].rank(l, r, 0);
			}else {
				nl=nz[bit]+b[bit].rank(0, l, 1);
				nr=nl+b[bit].rank(l, r, 1);
				k-=b[bit].rank(l, r, 0);
				ret|=1L<<bit;
			}
			l=nl;r=nr;
		}
		return ret-base;
	}
}


class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	
	void run() {
		FastScanner sc=new FastScanner();
		int N=sc.nextInt();
		long[] a=new long[N];
		for(int i=0;i<N;++i)a[i]=sc.nextLong();
		WaveletMatrix wm=new WaveletMatrix(a);
		PrintWriter pw=new PrintWriter(System.out);
		long ans=0;
		for(int K=1;K<=N;++K) {
			long[] right=new long[N/K];
			long[] left=new long[N/K];
			for(int i=0;i<N/K;++i)right[i]=wm.quantile(N-(i+1)*K, N-i*K, (K+1)/2-1)+(i>0?right[i-1]:0);
			for(int i=0;i<N/K;++i)left[i]=wm.quantile(i*K, (i+1)*K, (K+1)/2-1)+(i>0?left[i-1]:0);
			for(int i=1;i<N/K;++i)right[i]=Math.max(right[i], right[i-1]);
			for(int i=1;i<N/K;++i)left[i]=Math.max(left[i], left[i-1]);
			for(int i=-1;i<N/K;++i)ans=Math.max(ans, K*((i==-1?0:left[i])+(N/K-i-2==-1?0:right[N/K-i-2])));
		}
		pw.println(ans);
		pw.close();
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
}


class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}