#include <math.h>
#include<bits/stdc++.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n; 
    scanf("%d",&n);
    int *height = malloc(sizeof(int) * n);
    for(int height_i = 0; height_i < n; height_i++){
       scanf("%d",&height[height_i]);
    }
    sort(height,height[n]);
    int d=n-1,c=0;
    while(1)
    {
        if(height[d]>height[d-1])
            c++;
        d--;
        if(d==0)
            break;
    }
    cout<<c<<endl;
    return 0;
}