#include <stdio.h>

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