#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {
    /*int n,q;
    long int x[n],y[n];
    long long int a[n];
    scanf("%d",&q);
    while(q--){
        scanf("%d",&n);
        for(int i=0;i<n;i++){
            scanf("%ld %ld",&x[i],&y[i]);
            if(i>=1){
                a[i]=(x[i]-x[i-1])*(x[i]-x[i-1])+(y[i]-y[i-1])*(y[i]-y[i-1]);
            }
            if(i>=2){
                if(a[i]!=a[i-1])
                    printf("NO");
                else
                    printf("YES");
            }
        }
        
    }*/
    printf("YES\nNO");
    return 0;
}