var input = [
    '1 2 3 4 4 3 2 1'
];

var print = this.print || console.log;
var gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);

let array = gets().split(" ").map(Number);
let array1 = [];
let array2 = [];

for(let i = 0; i < array.length / 2; i++) {
    array1.push(array[i]);
}

for(let i = array.length -1; i >= array.length / 2; i--){
    array2.push(array[i])
}
let result = 0;
for(let i = 0; i < array1.length; i++) {
    if(array1[i] === array2[i]) {
       result += 1;
    }
}

if(result == array1.length) {
    print("Yes");
} else {
    print("No")
}