#include using namespace std; typedef long long ll; #define all(v) begin(v), end(v) #define FOR(i,a,b) for(int i=(a);i<(int)(b);i++) #define rep(i,b) FOR(i,0,b) const ll mod = 1e9+7; ll INF = 1000; ll n,k,a[100010],b[100010],ans; int main(){ cin>>n; rep(i,n)cin>>a[i]; ll temp=2*n-3; // for(ll i=0;i=n||i-j>=n)continue; if(a[i-j]