Au4D

#include <bits/stdc++.h>
using namespace std;


string str[100001];
int v[100001];

int main(void){
	int n,i,j,cont;
	scanf("%d", &n);
	for(i = 0;i<n;i++){
		scanf("%s", &str[i]);
	}
	for(i = 0;i<n;i++){
		for (j = i;j<n;j++){
			if (str[i].compare(str[j]) != 0 && i != j && v[i] != -1 && v[j] != -1){
				cont++;
				v[j] = -1;
			}
		}
	}
	printf("%d", cont);
	return 0;
}