A. Nicholas and Permutation

time limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Nicholas has an array a that contains n distinct integers from 1 to n. In other words, Nicholas has a permutation of size n.

Nicholas want the minimum element (integer 1) and the maximum element (integer n) to be as far as possible from each other. He wants to perform exactly one swap in order to maximize the distance between the minimum and the maximum elements. The distance between two elements is considered to be equal to the absolute difference between their positions.

Input

The first line of the input contains a single integer n (2 ≤ n ≤ 100) — the size of the permutation.

The second line of the input contains n distinct integers a1, a2, ..., an (1 ≤ ai ≤ n), where ai is equal to the element at the i-th position.

Output

Print a single integer — the maximum possible distance between the minimum and the maximum elements Nicholas can achieve by performing exactly one swap.

Examples

input

54 5 1 3 2

output

3

input

71 6 5 3 4 7 2

output

6

input

66 5 4 3 2 1

output

5

Note

In the first sample, one may obtain the optimal answer by swapping elements 1 and 2.

In the second sample, the minimum and the maximum elements will be located in the opposite ends of the array if we swap 7 and 2.

In the third sample, the distance between the minimum and the maximum elements is already maximum possible, so we just perform some unnecessary swap, for example, one can swap 5 and 2.

解题说明：此题要求1和n的距离最远，由于只有一次交换机会，肯定是把1或者把n移到数列的一端，考虑各种情况进行比较即可。

#include<cstdio>#include<iostream>#include<algorithm>#include<cstring>#include<string>#include<cmath>int main(){int n,arr[101],i,poss,posl,max;scanf("%d",&n);for(i=0;i<n;i++){scanf("%d",&arr[i]);if(arr[i]==1){poss=i;}if(arr[i]==n){posl=i;}}if(n-1-poss>n-1-posl){max=n-1-poss;}else{max=n-1-posl;}if(max<poss){max=poss;}if(max<posl){max=posl;}printf("%d\n",max);return 0;}