#include <stdio.h>

#define F(i,n) for(int i = 0;i < n;i++)

int main(void){
	int n,t,c=0;int r=0;
	scanf("%d",&n);
	int a[n],a2[n],b=0;
	F(i,n) a[i] = 0;
	F(i,n) a2[i] = 0;
	F(i,n){
		scanf("%d",&t);
		F(i,b+1){
			if(a[i]==t){c=1;a2[i]=1;break;}
		}
		if(c==0){
			b++;
			a[b]=t;
			r++;
		}
		c=0;
	}
	F(i,b+1){if(a2[i]==1)r--;}
	printf("%d\n",r);
	return 0;
}