#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <sys/stat.h>

struct answers_1{
    char* ans;
};

struct answers_1  get_file_name(int *mas, int x);


int main (void)
{
    struct answers_1  answers;
    char* path = (char*) malloc( 256 );
    int x = 0, buf = 0,i=0,b;
    
    printf("Input file name:\n");
    scanf("%s",path);
    
    FILE *in;
    in = fopen(path, "r");
    
    if (in == NULL) {
        exit(1);
    }

    
    while ((fscanf(in, "%d", &b)!=EOF)) {
        x++;

    }
    rewind(in);
    
    
    int mas[x];

    for(i=0;i<x;i++){
        
        fscanf(in, "%d", &buf);
        mas[i] = buf;
        
    }
    answers = get_file_name(mas,x);
    printf("%s\n", answers.ans);
    
}




struct answers_1  get_file_name(int *mas, int x){
    
    struct answers_1  answersf;
    answersf.ans = "YES";
    
     for(int i=0;i<x/2;i++){
         if (mas[i]!=mas[x-i-1]){
             answersf.ans = "NO";
             break;
         }
     }
    return answersf;

}