c(const void*a,const void*b){return*(int*)a-*(int*)b;}
int main(){
int n,i=0,a[100002]={};
scanf("%d",&n);
for(;i++<n;)scanf("%d",a+i);
qsort(a+1,n,4,c);
for(i=0;n--;)if(a[n]-a[n+1]&&a[n+1]-a[n+2])i++;
printf("%d",i);
return 0;
}