#include<iostream>
using namespace std;
const int N=105;
int n,f[N][N],ans,x;
int main(){
    cin>>n;
    while(n--){
        cin>>x;
        int i=1;
        while(i)
            if(!f[i][x]){
                f[i][x]=1;
                ans=max(ans,i);
                break;
            }else i++;
    }
    cout<<ans;

}