#include<stdio.h>
int num[100000];
main(){
    int N;
    scanf("%d",&N);
    for(int i = 0;i < N;i++){
        scanf("%d",&num[i]);
    }
    int count = 0;
    for(int i = 0;i < N;i++){
        if(!num[i]){continue;}
       int target = num[i];
       int c = 0;
       for(int j = i+1;j < N;j++){
           if(num[j] == target){
               num[j] = 0;
               c++;
           }
       }
       if(!c){count++;}
    }
    printf("%d\n",count);
}