#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n,count[n],max;
 
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        count[i]=0;
    int *height = malloc(sizeof(int) * n);
    for(int height_i = 0; height_i < n; height_i++){
       scanf("%d",&height[height_i]);
        count[height[height_i]]++;
    }
    max=count[1];
    for(int i=1;i<=n;i++){
        if(count[i]>max)
            max=count[i];
            i++;
    }
    printf("%d",max);
    return 0;
}