symm

//let input = [1, 2, 3, 4, 4, 3, 2, 1];//Yes
//let input = [3,4,5,3,4,5];//No
let input =[7,8,9,8,7] //Yes
let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
let symmetric = true;
let n =+gets();

// loop iterate up to the middle and compare first element with last element
for(let i=0; i<n/2;i++){
    if(input[i] != input[n-i-1]){
        symmetric = false;

    }

}
if (symmetric){
    print('Yes');
}
else {
    print('No');
};