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

int main(){
	int num = 0;
	scanf("%d",&num);
	char zodiac[num][10];
	for(int i = 0;i < num;i++){
		scanf("%s",&zodiac[i]);
	}
	
	int count = 0;
	for(int i = 0;i < num;i++){
		count = 0;
		for(int j = 0;j < num;j++){
			if(strcmp(zodiac[i], zodiac[j]) == 0){
				count++;
			}
		}
		if(count > num / 2 && (num - 2) != count){
			printf("NO");
			count = -1;
			break;
		}
	}
	if(count != -1){
		printf("YES");
	}
}