#include <stdio.h>

int main () {
  int x1 = 0;
  int y1 = 0;
  int x2 = 0;
  int y2 = 0;
  int x3 = 0;
  
  int res = 0;
  
  res = scanf("%d", &x1);
  res = scanf("%d", &y1);
  res = scanf("%d", &x2);
  res = scanf("%d", &y2);
  res = scanf("%d", &x3);
  
  if (y1 == y2) {
    printf("Yes\n");
  } else {
    printf("No\n");
  }
  
  return 0;
}